Computer: Ubuntu 20.04 LTS on iMac 27″ 2011 & 21″ 2015 | Spiritdude's Public Notebook
How to Install MacOS Catalina on Unsupported Macs | OSXDaily
MacOS Catalina Download Now Available to All Mac Users | OSXDaily
Mac OS CATALINA on a 2011 IMAC. I kept hearing it won't work because of the video card and would make my Mac unable to use but it is working for me.
How to Install macOS 10.15 Catalina on an Unsupported Mac - YouTube
Apple Myth 12 – How to install macOS Catalina (10.15.7) on unsupported Mac computer - ACE
Apple iMac 21.5" Late 2013 Catalina Intel i7|$ 230.00
macOS Catalina, Big Sur, Monterey & Ventura Incompatible with Microsoft Office 2008 & Office 2011 - Charlotte Street Computers - Apple Authorized Service Provider
Imac mid 2011 21,5 inch with Catalina 10.15.5 - YouTube
My mid-2011 Mac Mini at Work running MacOS Catalina 10.15.1 : r/mac