Recently bought a new '2016' MBP and while Painter worked fine on my old Mac, it refuses to install on this one. How can I downgrade to High Sierra from Catalina? It works fine on my old Mac with High Sierra.
Which version of Painter? 2020 or 2019? If either of these, consider going to Painterartist.com\download and get a new copy (be sure to unmount your old copy). There was an issue with Catalina and the older installers, but since then both have been updated on Painterartist and should install just fine on a 2016 Mac Book Pro.