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That depends. There is the 64-bit part of it, as Catalina no longer allows 32-bit apps. You can see this article, https://support.apple.com/en-us/HT208436, to see if there are 32-bit apps on her iMac.My wife's iMac is a 2011 model. I haven't updated it beyond 10.13.6. Should I update it to Catalina?