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I have an iMac (27-inch, Late 2013) with High Sierra OS 10.13.6, what OS is the newest that is compatible with this iMac.

What is the newest OS for my iMac 27-inch late 2013 computer?


Posted on Nov 16, 2021 6:37 PM

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Question marked as Top-ranking reply

Posted on Nov 16, 2021 7:37 PM

An iMac from 2013 can upgrade as far as macOS Catalina 10.15.7.


For Mojave or Catalina,


Open Safari and click on this link, 

How to get older versions of macOS

Go to the Use Safari to download macOS section and click on the OS you want to install.


Before upgrading make a full back up of your Mac.


Check that third party apps you use have updates available for the new OS.

https://roaringapps.com

Check that your printers/ scanners etc have updated drivers and software available for the new OS.


Connect your mac to your router via cable rather than rely on WiFi.

Do not use your mac while it is downloading

and do not use any other devices that share the same internet connection.


If the App Store says ‘Open’ then it is detecting a previous download of the install app

go to the Applications folder locate Install macOS ******.app.

Move it to the Trash, empty the Trash.

Restart, click on the link again, the App Store should say ‘Get' or 'Download'.


If you are considering upgrading to Catalina be warned it doe not support 32bit apps.

Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,

some updates may be free, some may be paid. Use this free app to discover which apps you have

are 32bit, https://www.stclairsoft.com/Go64/ then contact the developers of the software to see

if they are offering 64bit updates.

1 reply
Question marked as Top-ranking reply

Nov 16, 2021 7:37 PM in response to _RunAndSwim

An iMac from 2013 can upgrade as far as macOS Catalina 10.15.7.


For Mojave or Catalina,


Open Safari and click on this link, 

How to get older versions of macOS

Go to the Use Safari to download macOS section and click on the OS you want to install.


Before upgrading make a full back up of your Mac.


Check that third party apps you use have updates available for the new OS.

https://roaringapps.com

Check that your printers/ scanners etc have updated drivers and software available for the new OS.


Connect your mac to your router via cable rather than rely on WiFi.

Do not use your mac while it is downloading

and do not use any other devices that share the same internet connection.


If the App Store says ‘Open’ then it is detecting a previous download of the install app

go to the Applications folder locate Install macOS ******.app.

Move it to the Trash, empty the Trash.

Restart, click on the link again, the App Store should say ‘Get' or 'Download'.


If you are considering upgrading to Catalina be warned it doe not support 32bit apps.

Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,

some updates may be free, some may be paid. Use this free app to discover which apps you have

are 32bit, https://www.stclairsoft.com/Go64/ then contact the developers of the software to see

if they are offering 64bit updates.

I have an iMac (27-inch, Late 2013) with High Sierra OS 10.13.6, what OS is the newest that is compatible with this iMac.

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