How do I know if a printer is compatible with 64 bit computer?
Buying a new printer. I have a Catalina OS which is 64 bit. How do I make sure a new printer will work? Do I need to upgrade my wife's Yosemite O?S
iMac Pro
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When looking for a printer the box will probably tell you what OS's it is compatible with, or you can go to the printer manufacturers website support pages and check to see if they support Catalina for that printer model.
As for your wifes' mac it depends what model it is to which OS it can upgrade to, read the following Sections 1
in each How Too..
How to upgrade to macOS Mojave - Apple Support
How to upgrade to macOS High Sierra - Apple Support
How to upgrade to OS X El Capitan - 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.
If you are considering upgrading to Catalina be warned that it does not support 32bit apps.
Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,
some updates may be free, some may be paid. Use this app to discover which apps you have
are 32bit, https://www.stclairsoft.com/Go64/. Once the list has been created you can then
contact the developers of the apps to see if they provide 64bit updates.