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I have a late2012 MacBook Pro that I upgraded to Catalina (10.15.7) and just received an identical late 2012 MacBook Pro running OS X 10.8.5 and I can't upgrade it at all. I need to get to at least 10.9 to upgrade other software that has that as a minimum requirement. I can't find anything on the Apple website or the app store.
MacBook Pro 13″, macOS 10.15
Mountain Lion 10.8, El Capitan 10.11, Sierra 10.12, High Sierra 10.13, Mojave 10.14, Catalina 10.15, Bug Sur 11
Mountain Lion 10.8, El Capitan 10.11, Sierra 10.12, High Sierra 10.13, Mojave 10.14, Catalina 10.15, Bug Sur 11
The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Make sure to use Only Safari to commence the download as Other may not work
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is not workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation.
My issue, it turns out, was looking for the files I wanted by referring to them by version number and not the nickname Apple gives them. Oddly, I seem to be able to remember OS X 10.9 > OS X 10.10 > OS X 10.11 > OS X 10.12, but can't remember Mountain Lion > El Capitan > Mojave > Catalina > Big Sur.
The version of Safari that comes with OS X 10.8 is incompatible with the installer for OS X 10.11, so I used Chrome instead.
You can upgrade those to 10.11 then to 10.15.
How do I upgrade from OS X 10.8.5?
