It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Sometimes games don't launch because of the connected controller. Try unplugging it and see if that helped. If it didn't, you might also want to download Microsoft DirectInput - dinput8.dll file and extract it to the installation folder.
If you need any help with that or the above didn't solve your issue, submit a ticket to our Tech Support here :)