The real problem is they are using WebObjects technology for the backend coding for this site.. check the wiki...last stable release 2008.. initial release 1996... ancient for web technologies. :-)
https://en.wikipedia.org/wiki/WebObjects
Good luck getting this going, can't wait to download Pathfinder stuff, been wanting to play it forever and glad they put it on Humble Bundle even though they were not prepared for the onslaught!