I'm not really sure if this is possible or where to start, but what I am trying to do is not allow a user to run the setup if a serial number located on my web server doesn't exist. I am trying to keep it simple and just checking to see if a file exists.....like the setup checks my website is file 1234.txt exists. If the file exists, the installer allows the setup to begin, if not it doesn't.
Is there a way to do this in inno setup or would I need to call another .exe program first in some way?
Thanks