How to I update from Sierra late 2009 to Catalina?
how to I update from Sierra late 2009 to catalina? ultimately ending up with Big Sur?
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Ah, sorry, I misread the age of your computer. No, it doesn't appear to support Big Sur.
macOS Big Sur is compatible with these computers - Apple Support
No matter what interim version you update to, it doesn't appear to be possible to go to Big Sur.