I can't install iTunes 12.3 or OSX 10.8.5, do i need the mountain lion software?

Mac OS X 10.8.5 is Mountain Lion; if your Mac is compatible with it and has at least 2GB of RAM, upgrade to El Capitan or buy a download code for Mountain Lion from the online Apple Store.

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Check that your computer is compatible with Mountain Lion/Mavericks/Yosemite/El Capitan.

To check the model number hold down the option/alt key, go to the Apple menu and select System Information.

MacBook (Late 2008 Aluminum, or Early 2009 or newer) model number 5,1 or higher

MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher

Your Mac needs:

OS X v10.6.8 or OS X Lion already installed

2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)

8 GB or more of available space

Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.

Application Compatibility

Applications Compatibility (2)

Do a backup before installing, preferable 2 backups on 2 different drives.