I've had occasionally issues matching your description with Installshield on Windows 10, so try this to see if the issue's the same. I haven't tried Windows 11, so I'm assuming you can still do what I'm describing.
In Task Manager, go to the details tab, right click on the setup executable, and select "Analyse wait chain". If any other executables are being shown in the wait chain, close them. In my case it was nvcontainer.exe for some reason. The installation program would appear as soon as that program was closed.
https://community.pcgamingwiki.com/topi ... indows-11/
Worth trying if an installer dont seem to load in the first place or gets stuck. I wonder if Nvidia is gonna fix it, it seems like they are the cause of the problem..