Sorry Alan, you are correct. In your case the “fine print” applies.
I was in between support emails and obviously didn’t fully read your first post.
I went by the Subject: High Sierra Endless Loop Download as I’ve had a few 
clients & I think one WAMUG member with the problem and the restart with 
Option-Command-R 
into Recovery and install worked.

I apologize again.

Cheers,
Ronni 

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


> On 27 Apr 2018, at 2:04 pm, Alan Smith <[email protected]> wrote:
> 
> Thanks for responding Ronni.
> 
> The fine print of the Apple support article worries me.  It says - - -
> ** If you haven't already updated to macOS Sierra 10.12.4 or later, 
> Option-Command-R installs the macOS that came with your Mac, or the version 
> closest to it that is still available.
> I have Mavericks 10.9.5 installed. I therefore expect that High Sierra will 
> NOT be installed.  Late last year the standard Command-R macOS Recovery 
> utility reinstalled Mavericks 10.9.5.
> 
> Will you please check if Apple’s “big print” or “fine print” applies?
> 
> Cheers
> Alan
> 
>> On 27 Apr 2018, at 1:25 pm, Ronda Brown <[email protected]> wrote:
>> 
>> Hi Alan,
>> 
>> Click Restart , hold down Option-Command-R to boot into macOS Recovery, and 
>> reinstall the operating system. This way you will update to the lasted 
>> version of High Sierra that is compatible with your Mac.
>> 
>> (Did you know that different versions of Command-R cause different versions 
>> of macOS to be installed by macOS Recovery? 
>> Check out this Apple support article for the details.) 
>> 
>> Cheers,
>> Ronni
>> 
>>  Ronni Brown’s iPad Pro 12.9-inch 256GB 
>> 
>> 
>>> On 27 Apr 2018, at 9:11 am, Alan Smith <[email protected]> wrote:
>>> 
>>> I want to eke a few more years usage from my obsolete 21.5 inch late 2009 
>>> iMac fitted with obsolete OSX 10.9.5 Mavericks by installing macOS 10.13.4 
>>> High Sierra.
>>> 
>>> However the High Sierra download phase has so far consumed 46 GB for the 
>>> 4.8 GB OS file. This is from three download attempts from the App Store. I 
>>> click the “Cancel” download button to escape the endless loop.  I only 
>>> checked iiNet data usage after I cancelled the second attempt! 
>>> 
>>> Any suggestions for explaining the cause of the download loop - and for 
>>> installing High Sierra?
>>> 
>>> I have ascertained that when the OS file download progress indicator 
>>> reaches around 97% it appears to freeze. Activity Monitor of process 
>>> “osinstallerplaind” actually shows a steady download to about 4.8 GB on the 
>>> Network tab, pauses for say 10 seconds, then resumes counting ever higher.
>>> 
>>> The in-progress download file in 
>>> /Library/macOSInstallData/InstallESDmg.pkg.partial show the file appears to 
>>> be endlessly rebuilt.  File size reaches roughly around 4.8 GB then starts 
>>> again - the next Finder refresh showed say 250MB.
>>> 
>>> Something in the overall process is not taking the final step of stopping 
>>> the download and going to the installation phase.
>>> 
>>> iMac has 12MB RAM and a 1TB drive with 850 GB free space. This old Mac is 
>>> WiFi only due to a faulty ethernet port.  iMac is using the 2.4GHz band via 
>>> a Netgear R6400v2 router.  Time to download large files is about the same 
>>> as for other Macs connected via ethernet.  I’m on an NBN FTTP 50 Mbps 
>>> download speed plan.
>>> 
>>> Cheers
>>> Alan
>>> 
>>> late 2009 21.5 inch iMac, OSX 10.9.5
>>> late 2012 27 inch iMac FD, macOS 10.13.4
>>> 2017 Mac mini SSD, macOS 10.13.4
>>> 
>>> 
>>> 
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