FWIW, I just upgraded my late 2011 macbook pro to Catalina using http://dosdude1.com/catalina/ http://dosdude1.com/catalina/ because I needed the latest XCode.

FWIW, I just upgraded my late 2011 macbook pro to Catalina using http://dosdude1.com/catalina/ http://dosdude1.com/catalina/ because I needed the latest XCode. It's working fine, though you need to live with the fact that it's now a "compromised" system.