I think you should try to install .NETScript on your home machine to test.
Right now I write to you through my weak notebook.
This machine is not for developing or testing,
therefore it has not the installed AutoCAD. Also, for my desktop computer (this machine is unaccessible to me right now) I always use
remote debugging, therefore I separate machines for developing from the machines for testing: desktop machine is for developing and the virtual machines are for testing. Therefore I will never install the program intended for testing on the machine which is intended for developing.
I track some users are good and they don't have your issues that come from installing without admin rights.
Khoa, you are free to ignore my info about the Fatal Errors in AutoCAD. I don't insist on their correction. If your product is for private clients (instead of Windows domain users), then it perhaps they won't get the problems that was mentioned by me.