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

Apparently the latest update on Steam was version 3.2 (according to the Steam update history) but the last post here on the forum was 2.1. I prefer buying on GOG over Steam but just wanted to make sure the game is up to date here too.