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can iMac Sierra (late 2009) upgrade to macOS Catalina
No. See compatibility information in How to upgrade to macOS Catalina - Apple Support
It can upgrade to High Sierra: How to upgrade to macOS High Sierra - Apple Support
No. See compatibility information in How to upgrade to macOS Catalina - Apple Support
It can upgrade to High Sierra: How to upgrade to macOS High Sierra - Apple Support
Here are the requirements for installing Catalina:
A late ‘09 model can be upgraded to Mac OS 10.13.6 (High Sierra).
upgrading OS
