mac book air question on 32bit problem apps
Can you add to a mac book air that is 32bit to make it 64bit
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All Macs have been 64 bit since 2006. You don't need make a Mac 64 bit. Unless you have a pre 2006 Mac, its already 64 bit.
What you need to do, is make sure the Apps it is running are 64 bit.
See here: 32-bit app compatibility with macOS High Sierra 10.13.4 and later - Apple Support