thanks to Shaneee's guide I managed to install Mojave 10.14.4, and everything seems to be working great, also FCPX, but one exception:
Apple Motion 5.4.3, when I start it, the spinning wheel appears during the splash screen (activity monitor shows: motion unresponsive) - after a minute or so Motion 5 starts normally, showing the "open project" screen. There are no error messages.
Strangely enough, when I click on the project templates (for example 3D, Skyline etc), the spinning wheel appears again for 10 seconds or so before showing the templates - also if I go back and forth, always the spinning wheel.
Any ideas what this could be about?
Asrock B450M Pro4
Radeon Rx570 MSI Armor 8GB
16GB DDR4 Dual Channel