So, it didn't fix my issue and now I'm even more confused.
I tried to open the project included with the plugin and it said it's for GBStudio 4.2.0 (from what I know the newest version is 4.1.3). I opened the project anyways and it mostly worked correctly.
When I put the plugin in my game it crashed and displayed a white screen like before.
Also, change from GBT player to hUGETracker doesn't help