when you say "got a mini dump" is this when you try to load the game, or the mod?

1.)  I'm not sure what version forge tools 3 data was for... are you sure it was for 1.05 and not a later/earlier patch?

2.)   Are you putting the reference files in a subfolder of the mod folder?

Actually, I get the same error when trying to load it into 1.16 as well. And 1.15. I'm trying to load in the completely unchanged ReferenceData entities in, nothing more, and it's minidumping every time in both 1.16 and 1.15 (Developer exe). So I'm a bit baffled.

Is there any way to tell Impulse to only install up to the 1.15 version? That may be the problem there...