Hi Russ,
These errors can sometimes be painfully tricky to solve. Has it been running ok before or when did this happen? I am asking because Windows updates can play some tricks on NCS.
First I would like you do to a clean installattion described here so we have a fresh NCS and dll file How to make a clean installation of Netcam Studio
Run NCS without cameras and do not license. Is it running now or does it crash. If it runs add cameras since it can also be a camera that send corrupt data.
If it still crashes reinstall .Net Framework 4.8. You find that on the download page of Netcam Studio.
Still crashes it is most likely something in the Windows OS that interfere with the dll file. Do you have another computer that you can test with?
-Henrik