MacBook Air won’t download anything
i have a macbook air version 10.10.5 and when i try to intall a app it says “cant be installed on macintoch HD because OS X version 10.12 or later is required. what can i do to fix this problem
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You need to upgrade your macOS to Sierra or newer, here a some links with the newest first, check the compatibility chart to see if your Mac can install it.
How to upgrade to macOS Mojave - Apple Support
How to upgrade to macOS High Sierra - Apple Support
How to upgrade to macOS Sierra - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
