iMac is still on El Capitan 10 15 2. would like to upgrade to Catalina but system says I can
How do I upgrade iMac10.15.2 to Catalina? iMac running slow, so got Intego Security to clean up, but they want Mac on Catalina.
iMac, OS X 10.11
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You can't run Catalina on a 2009 iMac. It doesn't have the hardware to support it.
If it's a Late 2009 iMac you should be able to upgrade to High Sierra.
How to upgrade to macOS High Sierra - Apple Support
Be aware upgrading won't fix the slowness issue.
Try running EtreCheck and post the report.
Use the additional text icon under the reply window to paste in the report.