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

I need to make sure before I buy it
No posts in this topic were marked as the solution yet. If you can help, add your reply
No, not really. You might be able to use an older utility like Project Controller, but for the most part, if you want online coop you'll want to have the JJ2+ mod (which you can get directly from GOG).