When starting VATSpy, the program disappears and seems not to run (there’s no trace of it in the task manager). After a fresh install the software runs one time, but after closing and restarting it, it just disappears again. There is no error whatsoever.
Mine does this, but it runs on about the second or third attempt. I put it down to a failure to verify version or similar. I just persist with trying to launch it.
I remember this happening couple years ago, however, Vatspy showed in Task Manager for me. I would kill the program then relaunch & seemed to work. Hope you get it working.