Thanks! What I did was to copy the setup file without the command arguments to another directory and install from there.
That did the trick, but it seems a little deceptive if SourceForge is involved in the inclusion of those args.

Have figured it out, but not sure I could document the solution.
Basically the Sourceforge download included arguments pointing to Microsoft. I copied the installation file to another location without them, and that did the trick.

I just installed SH3D from SourceForge on a Windows 11 system.
But the .exe file does not appear anywhere under Program Files or Program Files (x6).
And every time I start it, SH begins with a window inviting me to "Try SH3D Pro for Free".
Unclear what is going on here; I can open it on my older ...