Good to hear Alan... success at last! 
Perseverance does pay off eventually :-))

The alert tone (single steady tone) might have been updating firmware before 
authorizing the download of the High Sierra helper.
I feel your system is needing some attention, and updating of third-party 
software and uninstalling software & add-ons that conflict with the running of 
High Sierra.

Cheers,
Ronni

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 4 May 2018, at 11:36 am, Alan Smith <[email protected]> wrote:
> 
> Hi Ronni
> 
> I am pleased - very pleased - to report success.  High Sierra has 
> successfully installed.  Security Update 2018-001 also installed.  With three 
> different model Macs I had three completely different experiences!
> 
> Thank you for your guidance through this exercise.  There are some slightly 
> odd things still happening, but I will let the iMac (and me) settle down 
> before I look at what I hope will be simple separate issues.
> 
> The actions I took between the Download and Installation seem innocuous, but 
> - -.
> 1. The download completed successfully via the “software updates available” 
> notification route.  It presented the expected install window.  This failed 
> at the “Install on Mac HD” step with a black screen. This seemed to be the 
> point that the “helper” file should be downloaded. 
> 2.  I shut down the Mac and did an SMC reset before starting the Mac a few 
> hours later.
> 3.  I deleted the Macs Fan Control app.  This was set up purely as a 
> monitoring utility and not to alter fan speed settings.  But it was an active 
> process that has its tentacles into the deep workings of the system.  I also 
> have MFC installed on the late 2012 iMac and the High Sierra installation 
> went without any hitch on that computer.
> 4.  I launched “Install macOS High Sierra” from Finder, not from Launchpad (I 
> think).
> 5.  The install process paused at the  “Install on Mac HD” step; the screen 
> went black.  After a few seconds I got an alert tone (single steady tone) 
> then a few seconds later it displayed a window to authorise download of the 
> High Sierra “helper” file.  And proceeded to install without further trouble.
> 
> Thank again for your advice.  No doubt I will be asking for more help at a 
> later date!
> 
> Cheers (times 3)
> Alan
> 
> 
>> On 2 May 2018, at 10:16 am, Alan Smith <[email protected]> wrote:
>> 
>> Hi Ronni
>> 
>> I am pleased to report progress.  But still not success.  The Install macOS 
>> High Sierra app has downloaded but will not install.  Details of recent 
>> events follow. 
>> 
>>  Do you want to continue with this original thread?  Your assistance is 
>> appreciated but you may wish to close off your help file.  I could start a 
>> new posting later, but I’m not ready to immediately respond.  At least it 
>> seems there is hope: I haven’t created a door stop and the biggest iPod in 
>> the world is still limping along. 
>> 
>> Early this morning I woke the iMac on my way to boil the kettle for coffee - 
>> and got an Apple Notification that software updates were ready to install.  
>> I responded with my usual “later - tell me again tomorrow”, then opened App 
>> Store to see what software it was.  High Sierra!  Was this meant to be?  I 
>> had almost finished the pre-installation checks and clean up of apps etc, so 
>> was “near enough".  I selected “Install” from the update list.
>> 
>> High Sierra downloaded a 5.23 GB file in one step. Earlier attempts at 
>> downloading involved several steps - download of an installer file of about 
>> 23 MB and then a small helper file before the real download began (but never 
>> arrived).
>> 
>> The Install macOS High Sierra window opened so I clicked the Continue 
>> button.  I accepted T&C but the "Install on Mac HD" button did not respond.
>> 
>> There is a corresponding Console activity log entry when I press the Install 
>> button.  This refers to "InstallAssistant_plain: unable to simultaneously 
>> satisfy constraints" and then has several lines of details, including 
>> details about NS autosize and Mask layout.
>> 
>> Here are two of the things I’ve done as part of Mac clean-up.  They may show 
>> some light on the original “endless loop” problem and the new “will not 
>> install” problem.
>> 
>> 1. I downloaded three apps from App Store to test if general apps were 
>> failing too.  The apps downloaded but one crashes on launch. The associated 
>> Console log messages include NS Mask layout failures.  Not quite the same 
>> message as given by the High Sierra Installer, but  perhaps the same area.
>> 
>> 2. Apple Hardware Test via original install cd returned a 4 MEM error. I 
>> located and removed the faulty Amicroe 4 GB RAM module.  2009 Mac now 
>> reduced to 8 GB of RAM. 
>> 
>> I have not pursued or made web searches for clues on the new behaviour. My 
>> internet access completely failed around 9:00 am.  This since returned but 
>> no iiNet network status entry to explain it.  
>> 
>> Hope this sheds some light on things. 
>> 
>> Cheers
>> Alan
>> 
>> 
>>> On 29 Apr 2018, at 12:02 pm, Ronda Brown <[email protected]> wrote:
>>> 
>>> Hi Alan,
>>> Spotlight takes quite a long time as it has to Reindex the drive.
>>> Also when it has finished.
>>> Check your hard drive do a Repair in Disk Utility. Just use Disk Utility on 
>>> the iMac to Repair the drive, might be a couple of ‘niggles’ need repairing 
>>> on the Drive.
>>> 
>>> Cheers 
>>> Ronni
>>> 
>>> Sent from Ronni's iPhone 7 Plus
>>> 
>>>> On 29 Apr 2018, at 10:43 am, Alan Smith <[email protected]> wrote:
>>>> 
>>>> Hi Ronni
>>>> 
>>>> An update, just for information.
>>>> 
>>>> Couldn’t resist getting on with the job.  I  did a complete restoration 
>>>> from the SuperDuper bootable backup. There was a problem.
>>>> 
>>>> Very slow on restarting first time after Restore.   Not all menu bar app 
>>>> icons had loaded.  I allowed a few minutes but no progress.  I started a 
>>>> song in iTunes and it worked - for about one minute, then the system 
>>>> crashed.  “Your computer was restarted because of a problem”.  The problem 
>>>> report of the panic showed BSD process was mds.  Comment was “a freed zone 
>>>> element has been modified: expected (x)  but found (y) etc”.  So probably 
>>>> just a Spotlight indexing issue. 
>>>> 
>>>> I did an SMC reset.  Mac now looks ok, menu bar icons ok and  iTunes music 
>>>> has been playing ok for last hour.
>>>> 
>>>> I can now gradually do all the little things before I try for another High 
>>>> Sierra download.
>>>> 
>>>> Cheers
>>>> Alan
>>>> 
>>>> 
>>>>> On 28 Apr 2018, at 8:58 pm, Alan Smith <[email protected]> wrote:
>>>>> 
>>>>> Hi Ronni
>>>>> 
>>>>> I exclude ~/Music from TM backups because there is no need for it.  I 
>>>>> have several other copies of my iTunes music, apart from formal 
>>>>> SuperDuper backups.  On other devices I try to keep such libraries on an 
>>>>> external drive to keep the actual computer clean and mean.  The 2009 Mac 
>>>>> iTunes library also has a changing content of videos copied from my 
>>>>> master collection on an external drive.  I keep a selection of favourite 
>>>>> videos for those Apple TV times when I am immobile and the Mac mini is 
>>>>> otherwise occupied with Eye TV recording or processing.  I used to get 
>>>>> video artefacts from time to time when the more powerful 27 inch iMac had 
>>>>> to do all the work.  By the way, most of my home network is wired 
>>>>> ethernet. 
>>>>> 
>>>>> With three computers writing their Time Machine backups to one Time 
>>>>> Capsule  drive I found large backups worked but were were often delayed.  
>>>>> Time Machine backups from three computers to the equivalent Netgear 
>>>>> router were not reliably managed at all.  I bought the Netgear because 
>>>>> the Time Capsule showed early signs of failure.  In practice I run dual 
>>>>> backups for each computer using a local external drive plus  the central 
>>>>> Time Capsule.  I even run a third TM backup for the main 27 inch iMac to 
>>>>> a “network" drive on the Netgear router.  It copes with a single data 
>>>>> source without issues.  
>>>>> 
>>>>> The 2009 iMac local external dedicated Time Machine drive is a Firewire 
>>>>> 800 WD My Book Studio. This is quick and easy to use.  The SuperDuper 
>>>>> backup shares a partitioned drive with the 27 inch Mac on a Seagate 
>>>>> GoFlex drive that annoys me a bit.  It always makes lots of clunky sounds 
>>>>> whenever it is plugged in - possibly clogging up Spotlight with unwanted 
>>>>> data!  And I’ve used Time Machine Restore previously and found it quick, 
>>>>> quiet and reliable.  And I’ve not made a full Restore using SuperDuper 
>>>>> before.
>>>>> 
>>>>> Why would you re-install the complete os and data, including the iTunes 
>>>>> files, anyway?  
>>>>> 
>>>>> My current thoughts about the problem is that is NOT an endless loop of 
>>>>> one download after another.  I think the real download fails very early 
>>>>> in the sequence, but the App Server just keeps pumping out bytes but 
>>>>> there is no “Install” file to write it to. 
>>>>> 
>>>>> Thank you, I received your H.S. Upgrade tutorial and all conditions are 
>>>>> fulfilled or in hand.  Must catch up with my real life so will not have 
>>>>> so much time for this simple little task of installing HS for a while.
>>>>> 
>>>>> And thanks again for keeping me at the task and for your prompt responses.
>>>>> 
>>>>> Cheers
>>>>> Alan
>>>>> 
>>>>> 
>>>>>> On 28 Apr 2018, at 12:39 pm, Ronda Brown <[email protected]> wrote:
>>>>>> 
>>>>>> Hi Alan,
>>>>>> 
>>>>>> Why would you exclude your ~/Music folder from TM backups when you 
>>>>>> wanted to use the 2009 iMac to listen to music?
>>>>>> Why didn’t you do a complete system restore using your SuperDuper! 
>>>>>> backup that has your complete system backed up - that you did just 
>>>>>> before you commenced trying to upgrade the iMac to High Sierra?
>>>>>> 
>>>>>> 1. I would do a full system restore from the SuperDuper! backup first as 
>>>>>> it has the whole computer system (including ~/Music folder) backed up.
>>>>>>  
>>>>>> 2.Then if you received my tutorial ‘PREPARE TO UPGRADE TO HIGH SIERRA 
>>>>>> 10.13 I sent to you “OffList” last night. Follow that, before attempting 
>>>>>> to download and install High Sierra!
>>>>>> 
>>>>>>> The full SuperDuper backup is 142.9 GB.  The ~/Music folder is 118.7 
>>>>>>> GB.  Therefore OS and data is 23.2 GB.
>>>>>> 
>>>>>> My calculation is 24.2GB but it’s not really important.
>>>>>> 
>>>>>> Cheers,
>>>>>> Ronni
>>>>>> 
>>>>>>  Ronni Brown’s iPad Pro 12.9-inch 256GB 
>>>>>> 
>>>>>> 
>>>>>>> On 28 Apr 2018, at 10:34 am, Alan Smith <[email protected]> wrote:
>>>>>>> 
>>>>>>> Hi Ronni
>>>>>>> 
>>>>>>> The whole system was restored from Time Machine except for  the ~/Music 
>>>>>>> folder which is excluded in backup options.  
>>>>>>> 
>>>>>>> The newly restored 2009 iMac with OSX 10.9.5 Mavericks is 23.99 GB.
>>>>>>> The full SuperDuper backup is 142.9 GB.  The ~/Music folder is 118.7 
>>>>>>> GB.  Therefore OS and data is 23.2 GB.
>>>>>>> 
>>>>>>> How is this so?  I have three Macs. 
>>>>>>> 
>>>>>>> The  27 inch late 2012 iMac (High Sierra) is my workhorse.  This was 
>>>>>>> bought to replace the 21.5 inch late 2009 iMac (Mavericks) which had an 
>>>>>>> argument with lightning and lost its ethernet port.  The “new" computer 
>>>>>>> developed a problem during 2017 - it shuts itself down after being 
>>>>>>> active for around 5 days and requires an SMC reset before restarting.  
>>>>>>> Not very useful for EyeTV recording and AppleTV etc.  I eventually took 
>>>>>>> it to the Apple Genius Bar for repair.  Not happy about that 
>>>>>>> experience.  Suffice to say they didn’t fix it.  Hence - -
>>>>>>> 
>>>>>>> I bought an SSD Mac mini as my media machine. Stays powered on 24/7 for 
>>>>>>> EyeTV recording and processing, and for Apple TV.  Most data (movies 
>>>>>>> etc) are on an external high capacity hard drive.  Hence - - 
>>>>>>> 
>>>>>>> The 2009 Mavericks machine became my kitchen computer which I use it 
>>>>>>> for Safari, playing music and occasional Zoom video meetings.  I only 
>>>>>>> occasionally shut it down even 'tho it is a gas guzzler compared to the 
>>>>>>> later model Macs.
>>>>>>> 
>>>>>>> Yes, Ronni, I did Restore (almost) the whole system!
>>>>>>> 
>>>>>>> I will restore the Music folder from the SuperDuper backup.  I will 
>>>>>>> check out the computer and  prepare it for High Sierra.  May take a few 
>>>>>>> days.
>>>>>>> 
>>>>>>> What is your advice for the next step?  Try a new App Store download?
>>>>>>> 
>>>>>>> Cheers
>>>>>>> Alan
>>>>>>> 
>>>>>>> 
>>>>>>>> On 28 Apr 2018, at 7:58 am, Ronda Brown <[email protected]> wrote:
>>>>>>>> 
>>>>>>>> Hi Alan,
>>>>>>>> 
>>>>>>>> I asked you to Restore the whole system! It will take much longer than 
>>>>>>>> 20mins.
>>>>>>>> 
>>>>>>>>>>> Restore the complete contents of your hard drive from the Time 
>>>>>>>>>>> Machine backup you did before you commenced trying to upgrade to 
>>>>>>>>>>> High Sierra.
>>>>>>>>>>> Or Restore from the SuperDuper you did before you commenced trying 
>>>>>>>>>>> to upgrade to High Sierra.
>>>>>>>> 
>>>>>>>> Time Machine automatically backs up your entire Mac, including system 
>>>>>>>> files, applications, accounts, preferences, email messages, music, 
>>>>>>>> photos, movies, and documents.
>>>>>>>> 
>>>>>>>> Restore From Time Machine Backup: Restore your Mac from an external 
>>>>>>>> hard drive or Time Capsule that contains a Time Machine backup of your 
>>>>>>>> Mac.
>>>>>>>> 
>>>>>>>> How to restore your hard drive from a Time Machine backup
>>>>>>>> Whether you're having major problems with your current hard drive or 
>>>>>>>> upgrading to a new Mac, Time Machine can help you get back to business.
>>>>>>>> 
>>>>>>>> Power up your Mac and hold down the Command and R keys to enter the 
>>>>>>>> macOS Recovery Partition. Your Mac should boot to a screen that says 
>>>>>>>> macOS Utilities.
>>>>>>>> Select Restore from Time Machine Backup and click Continue.
>>>>>>>> Read the info on the Restore Your System page and click Continue.
>>>>>>>> Select your Time Machine backup and click Continue.
>>>>>>>> Select the most recent backup of your hard disk and click Continue. 
>>>>>>>> Your Mac will then restore the Time Machine backup; once it's done it 
>>>>>>>> will restart.
>>>>>>>> Cheers,
>>>>>>>> Ronni
>>>>>>>> 
>>>>>>>>  Ronni Brown’s iPad Pro 12.9-inch 256GB 
>>>>>>>> 
>>>>>>>> 
>>>>>>>>> On 28 Apr 2018, at 7:07 am, Alan Smith <[email protected]> wrote:
>>>>>>>>> 
>>>>>>>>> Correction and update!
>>>>>>>>> 
>>>>>>>>> There is probably no missing data or folders. I forgot that  ~/Music 
>>>>>>>>> is excluded from TM backups.  Also I don’t use Mail on this iMac so 
>>>>>>>>> the Contacts app would have no cards.  Sorry for this.  I assume 
>>>>>>>>> Recovery Mode looked at the total history data of Time Machine to 
>>>>>>>>> calculate the remaining restoration time.  
>>>>>>>>> 
>>>>>>>>> I will proceed with normal testing of apps and data - and will wait 
>>>>>>>>> for Ronni’s advice before I attempt a new download of High Sierra.
>>>>>>>>> 
>>>>>>>>> Alan
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>>> On 28 Apr 2018, at 6:23 am, Alan Smith <[email protected]> wrote:
>>>>>>>>>> 
>>>>>>>>>> Hi Ronni
>>>>>>>>>> 
>>>>>>>>>> I did a restore from Time Machine via Recovery mode for data at 25 
>>>>>>>>>> April, but got a strange outcome.
>>>>>>>>>> 
>>>>>>>>>> After about 20 minutes with around 15% restore and estimated 2 hours 
>>>>>>>>>> remaining, I got the “Restore Succeeded” window with a “Restart to 
>>>>>>>>>> Continue" banner.  This proceeded normally to login and then to 
>>>>>>>>>> prompts similar to a new OS installation.  
>>>>>>>>>> 
>>>>>>>>>> The desktop display looked normal superficially.  The Dock showed 
>>>>>>>>>> some apps that had been removed some time ago. The Finder sidebar 
>>>>>>>>>> showed the default options, not my preferences.
>>>>>>>>>> 
>>>>>>>>>>  I opened a few apps.  Some seemed OK but Contacts only has 2 cards 
>>>>>>>>>> (Apple inc and Me) and iTunes gave a “no library found” message.  
>>>>>>>>>> The “Music” folder in the Home directory is empty - no iTunes 
>>>>>>>>>> folders!  Finder shows 975GB available on the 1TB hard drive. I was 
>>>>>>>>>> expecting around 850GB free.  iTunes would probably account for most 
>>>>>>>>>> of the missing data - say 65GB music plus some movies and videos.
>>>>>>>>>> 
>>>>>>>>>> I have not attempted any data recovery or conducted detailed tests 
>>>>>>>>>> of apps.  I will wait for your comments before I proceed.
>>>>>>>>>> 
>>>>>>>>>> Cheers
>>>>>>>>>> Alan
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>>> On 27 Apr 2018, at 8:13 pm, Ronni Brown <[email protected]> wrote:
>>>>>>>>>>> 
>>>>>>>>>>> Hi Alan,
>>>>>>>>>>> 
>>>>>>>>>>>>> On 27 Apr 2018, at 6:21 pm, Alan Smith <[email protected]> 
>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>> 
>>>>>>>>>>>>> 
>>>>>>>>>>>>> It might be best to go back and install the backup you did in 
>>>>>>>>>>>>> Mavericks 10.9.5 before you commenced trying to upgrade to High 
>>>>>>>>>>>>> Sierra.
>>>>>>>>>>>> 
>>>>>>>>>>>> Do you mean reinstall the OS via the Recovery utility or a 
>>>>>>>>>>>> complete copy of OS and data from Time Machine (or Super Super)? 
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> Restore the complete contents of your hard drive from the Time 
>>>>>>>>>>> Machine backup you did before you commenced trying to upgrade to 
>>>>>>>>>>> High Sierra.
>>>>>>>>>>> Or Restore from the SuperDuper you did before you commenced trying 
>>>>>>>>>>> to upgrade to High Sierra.
>>>>>>>>>>> 
>>>>>>>>>>> The SuperDuper Manual will show you How To Restore from SD Backup.
>>>>>>>>>>> If you need more details I did a PDF Tutorial for a client some 
>>>>>>>>>>> time back … "How to Restore from a SuperDuper! Backup.pdf”
>>>>>>>>>>> If you need details how to "Restore the complete contents of your 
>>>>>>>>>>> hard drive from a Time Machine backup” I’ll post details to the 
>>>>>>>>>>> list.
>>>>>>>>>>> 
>>>>>>>>>>> I have been doing support work since 5:30am this morning, so I’m 
>>>>>>>>>>> now signing off for tonight. 
>>>>>>>>>>> 
>>>>>>>>>>> Cheers,
>>>>>>>>>>> Ronni
>>>>>>>>>>> 
>>>>>>>>>>> 13-inch MacBook Air (April 2014)
>>>>>>>>>>> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
>>>>>>>>>>> 8GB 1600MHz LPDDR3 SDRAM
>>>>>>>>>>> 512GB PCIe-based Flash Storage
>>>>>>>>>>> 
>>>>>>>>>>> macOS High Sierra 10.13.4
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