Some people (like me) happened to have a bug (the lower version bug, again) that can be resolved in 3 steps.
Step 1: Uninstall BG (including the files, use this command in Run ( %LOCALAPPDATA%)
Step 2: Reinstall BG again and wait for the files to unzip.
Step 3: If this dosen't work, try to contact the mods bc they know more about the game. (They know more about BG better than me bc theyr'e the devs, not me.)