tydog98: It is in compatibility mode, as that was the required fix for the "runtime error 9" error. I have no idea what the issue will be, so I'll just wait for your new version. Also, when I run it as an administrator, it asks for the CD key (I have the physical version, not GOG) but when I run it normally, it does not. Is that normal?
Damn, I thought the crash was perhaps the same as the runtime error problem.
As for the CD Key, no it shouldn't be asking for it at all. If the game is properly using the Last Resort hacked executables then it should not ask for a CD key since the executables are based upon a NO CD KEY cracked executable.
When I get time soon I will experiment more with Windows 10. I wonder if your Swat.ini or Swat.cfg files somehow got mangled. There should be a BACKUPS folder in your SWAT3 folder with backups of those two files. The backups were made when you first installed the mod.