Also, I have zero knowledge in the matter, but the steam demo version is not strictly "windows", but "web", and greenwork files for linux are uploaded with it. Are RPG maker web games compatible with linux? Because in that case MAYBE it might work without Proton.
Viewing post in The Respawn Banter on STEAM! Demo v2.0.3b comments
Wine alone can't work. Used these Launch Options: "PROTON_LOG=1 WINEDEBUG=+process %command%" got:
"Cloud management controller initialization aborted as CBCM is not enabled."
https://stackoverflow.com/questions/76607177/cloud-management-controller-initial...
From half a year ago says it's a Selenium Version issue?