Yosemite iMac won't run AC23

[lagodue]

All - my 2012 iMac running Yosemite 10.10.5 system software cannot be upgraded to run AC23. Does anyone know if there is a hardware part (CPU maybe) that can be changed out so latest Apple OS can be installed?

[Karl Ottenstein]

If it is really a 2012 iMac (vs an older one purchased then), it can be upgraded to Mojave (and should have been a long time ago). Mojave will run AC 23 just fine.

Since you have not updated at all since 10.10 (5 version of the operating system have been released since then)... it may be a fear of updating? Be assured, when you upgrade your MacOS, it has not affect on your data files and settings - only the OS. Still, it is wise to do a complete backup before updating!

https://support.apple.com/en-us/HT210190

[Ralph Wessel]

Adding to Karl's observations, you should be able to update a 2012 iMac to the very latest OS – refer to this page for a list of compatible hardware: https://support.apple.com/en-gb/HT210222

[lagodue]

Thx for the replies.
I based my question on Apple's website telling me I could not upgrade the OS.

Since then, I have managed to upgrade step by step - Yosemite/Mojave/Sierra/High Sierra - without any hardware upgrades.

All is well!