Hi Andrew, I tried that and installed Amplitube 3.15 but it still does not work. I did this after upgrading to Catalina, so is this the problem? I also installed the latest version of Authorisation manager 1.0.27 which works fine. On opening Custom shop 1.9 it then tells me there is a newer version which turns out to be Amplitube 4.9.0 but this is incompatible and cannot be installed at all?