Not able to open eM Client on my computer /activate Pro License

I am not able to open the program eM Client on my computer.

Use eM Client now since June 2020 approximately and bought the “Pro-Licence” which I woul lik eto activate today.

Looking forward to your reply.

What error do you get when you open the application?

Did you try uninstalling, and then downloading again and installing the latest version from the Release History?