I have the same problem as the original author.

1. Trying to connect from the VPN icon in the Windows tray
2. Connect failed (error code: 13XXX, I don't remember)
3. Uninstalling Opera Browser from Windows and reinstalling it
4. Re-logging in to Opera Browser
5. Re-installing Opera VPN client
6. Re-error during installation
   Message: Service 'Opera VPN Pro service (VPNProService) failed to start. Verify that you have sufficient previleges to start services.

I have no problems with the Internet connection and my subscription period is still valid.
Opera Browser on my phone (Android) has no problems with the VPN connection. It seems that the problem is with Windows, so I hope the administrator can help me solve it.