Same issue here on two systems - One is my old (Gen 6 i7 32GB RAM current work system with a 2070 Super) system but fully updated Windows 10 including nVidia drivers - on which I've been able to use 3DSMax without any issues - I'm reinstalling it as I've got a project on right now that needs it.
The other is a brand new Ryzen 3900 with a 2080ti and 32GB RAM. Haven't started using this as a work system yet as I can't get 3DSMax 2021 to install on it. This machine is fresh and also completely updated.
I'm trying the direct download link now and will update if that changes anything.
One note of interest - If I watch task manager while this process starts I see the Autodesk Desktop app and another process pop up temporarily before the installer crashes out with the Unhandled unknown Exception error.
I have:
Uninstalled everything Autodesk related.
Tried to install the Autodesk Desktop app separately - this appears to have worked but won't do any updates etc. and won't install 3DS Max
Disabled UAC, antivirus and firewall.
Rebooted with no other apps running.
Reg cleaned the old PC
Searched for hours online for solutions...
I have not:
Reinstalled windows (it's only just been installed on the Ryzen)
Tried the direct download version from the link provided
Additionally - I've never got any other response than the error mentioned - and the error dialog box is EXACTLY the same as the error posted by another user regarding the installation of Maya.
I'll check back in once the direct download finishes.
Cheers all,
Nathan.