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

Other thread says its solved but it clearly is not. I am having this issue on windows 10 and have tried all compatibility modes ect.

Do we know if GOG actually provides patches or support for this ?
I did manage to get it working (only tried one game so far though) by uninstalling then reinstalling. After that, instead of using the W98 compatibility I used the XP service pack 2 compatibility instead. Was fine for the match I played, which is more than I can say for the first installation I had running.