Are you still trying to use the demo version on Windows 10 (1903) as in this post of yours?
If so then just reply to that post rather than creating a new one.
As suggested it may have something to do with that Windows version.
Last time I looked my Windows had not upgraded to this version so I can't say if it is a problem or not.
If you are using a FULL licensed version then you can contact your local Archicad support.
I am not sure if you will have access that support with a trial version.
But I would hope they would tell you if there are any conflicts with that Windows build.