specifically this post by erebusant:
What is occuring is BG2 Fixpack modifies AR0602.bcs to take away the pause and drop exploit. BG2 Fixpack decompiles AR0602 to baf, and replaces the original text HideGUI() with the text ActionOverride(Player1,MakeUnselectable(2147483647)) HideGUI(), and further replaces the text ActionOverride(Player1,DestroyAllEquipment()) with the text ActionOverride(Player1,MakeUnselectable(0)) ActionOverride(Player1,DestroyAllEquipment()) and then recompiles the baf back to the bcs. This is what's still in your original AR0602.bcs so that tells me this block wasn't replaced by BGT's tp2 for some reason. What makes BGT's tp2 replace this block it the presence of the file G3blank.mus in your BGII-SoA\music directory, which I believe you'll find you do not have. Since it doesn't exist because the Super Happy Modder pack wasn't installed, Setup-BGT.tp2 never even tries to find BGT/Compat/BG2FixPk/Replace/rAR0602.BAF in order to replace the text you have above, and instead attempts to replace a different bcs block in your AR0602.bcs that does not exist. That being the case, I believe you'll find the 2nd of the 2 warnings I listed above. Long story short, in order to resolve this for everyone who uses BG2 Fixpack and BGT, but does not install the BG2 Fixpack "Super Happy Modder Pack" component, is for Ascension64 to identify a different marker for the BG2 Fixpack compatibility fix in his BGT.tp2.
Ronin