Hi, to install Ckan on MacOs, you have to install MonoFramework-MDK (latest version not Visual Basic), then it works, but after that you have to use ckan with the MacOs virtual keyboard.
Use "TAB" key to move the selection cursor between search line and mods, and if your keyboard does not work for Ckan, use pure virtual keyboard FN + F9, F10...
I use KSP + Ckan on Mac Pro/Big Sur.