Hello,
1. WARNING!!! The program requires constant(!) Internet connection for license validation! Make sure your Internet access is active and work correctly all the time while playing the game.
2. Make sure you’re launching the game with administrator privileges (right click on its' shortcut and choose "Run as administrator" in the context menu).
3. Make sure your firewall or antivirus or anything else doesn't block the Internet access for the game.
4. Add the game to the exceptions of your antivirus/firewall software.
5. Turn off any antivirus or firewall software (including the Windows built-in).