If goldys is running BUG in custom assets, which is recommend for posting forum games, then you should be able to open it fine in BAT. However, I think this is not the case - goldys has it installed as stand-alone. So what you can do, Greep, is open the original save in worldbuilder, save as a WB file, and the load BAT and play it as a scenario. Then follow the instructions from Nobles Club games regarding loading WB files as far as what to add for the barbs. You will at least need to add archery to the barbs and possibly hunting as well. (that would be in WB after loading the scenario)
The other option is install BAT in custom assets, which is much trickier. You'll have to find someone who knows how to do it. It's actually something I would not mind doing at some point.