Hello! I seem to be having a similar issue. I managed to install a soundset as a little test mod in BG:EE a few months ago, but now I'm trying to install it on BG2:EE and the same message appears. I'm also using version 2.6.6.0. The exact same message appears for me, except it says " but I was only given 48 things to append" instead.
I just copied the folder and the setup file into my BG2 directory. Not sure if that's the cause. I'm very technologically-challenged so I'm sure I'm missing something obvious. I'd appreciate any help.
