Draftsight 2021 SP0 Wont Open

Hi,

I had a trial version of draftsight and later purchased professional license. Downloaded and installed Draftsight 2021 SP0 from the website. 

Now after the successful installation, the software wont launch at all. I have tried re-installing it but no success. Ran as Administrator, turned off Firewall, antivirus everything still no success.

Please help.