Updating from Sierra
How can I upgrade my mac from Sierra OSX 10.12.6 to the latest system suitable?
iMac 27″, macOS 10.12
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Back up your data, check your applications for compatibility, click here, and then on the download link for a newer OS. A Mac running Sierra can be upgraded at least as far as High Sierra.
Catalina and higher won't run 32-bit software; download and use Go64 as well as using the first link above.
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