Do you have “Download newly available updates in the background” selected on 
the iMac?

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


> On 9 Jan 2018, at 1:36 pm, Jennifer Lefroy <lefroy.jenni...@gmail.com> wrote:
> 
> Thank you, Ronni.  It is good to understand the process and to be reassured 
> nothing untoward is happening. 
> 
> all good wishes,
> Jennifer 
> 
>> On 9 January 2018 at 11:55, Ronda Brown <ro...@mac.com> wrote:
>> Hello Jennifer,
>> A update was installing & it had to complete before startup could happen.
>> You probably have Automatic Downloads turned on your Mac
>> 
>> How to turn on — or turn off — automatic downloads on your Mac
>> 
>> 1. Launch the Mac App Store on your Mac.
>> 2. Click on App Store in the menubar.
>> 3. Click on Preferences in the dropdown menu.
>> 4. Check the box to the left of Download newly available updates in the 
>> background.
>> 
>> 
>> To disable background updates, repeat the same process and uncheck the box.
>> 
>> 
>> Should I leave background downloads on?
>> 
>> If you hate waiting for updates to download, then yes. Then, whenever you 
>> want to update, it'll be ready and waiting for you. Apple will never install 
>> an update without your express permission — or action! — but they'll make 
>> sure you don't have to wait when you want to install it.
>> 
>> If you have limited bandwidth or you don't want to update to newer version — 
>> for example if you're running a production system and need to wait for apps 
>> or drivers to update first — then no. Leave it unchecked and only download 
>> when you're sure you really want to.
>> 
>> Kind regards,
>> 
>> Ronni
>> 
>> Sent from Ronni's iPhone 7 Plus
>> 
>> 
>>> On 9 Jan 2018, at 9:54 am, Jennifer Lefroy <lefroy.jenni...@gmail.com> 
>>> wrote:
>>> 
>>> Today the start up of my Mac desk top (new at the end of Nov 2017) the 
>>> start up showing start up bar was interrupted and then reappeared with the 
>>> message "Installation in Progress. Calculating Time Remaining.  It then 
>>> took probably 10 to 15 mins before the desktop appeared.  Why did this 
>>> happen and does it matter?
>>> 
>>> Thank you for the reminder about dues, Stephen ad Ronni, and a satisfying 
>>> 2018 to everyone.
>>> 
>>> Many hanks, 
>>> Jennifer
>>> 
>> 
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