*Gracias a mi socio Christsnatcher y @ Leader
A clean GOG installation with all DLC and expansions v1.30 (v126.96.36.199) is required for this patch!
This update patches the main game, the 16 free DLC and both expansions to v1.31 GOTY.
Only the English language files will be updated by this xdelta (I do not have the other localization files).
Copy ALL files from the "Update" folder to your game folder and run the .bat file to patch your game files.
To be complete grab the attached .reg file, open it in a text editor and change the paths according to your game installation, then merge the file with your registry.
Many thanks to |Leader| for the updated files!