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A mac from 2010 cannot install macOS Catalina, it does not meet the hardware requirements.

If you want to check read Section 1 in this Apple article,

How to upgrade to macOS Catalina – Apple Support

If you want to upgrade your mac from macOS Sierra then you can upgrade to High Sierra,

How to upgrade to macOS High Sierra - Apple Support

That Mac isn't capable of running Catalina. If desired, back up your data, check your applications for compatibility, and download High Sierra.

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