I'm glad to inform that my problem was finally fixed and I can play Wol now!
Turns out it was something related to windows updates: over the past 3 days, I installed over 200 updates for windows that had been acumulating over the years, and then everything was functional again; I didn't even had to run the UHC patcher.
I guess the lesson here is to keep your system updated.
Thanks to everyone who replied to this post showing your support, it adds to to the awesomeness that this mod is!
PD: My first civ was colombians, since I'm a colombian myself, and i noticed that the voices are the default ones for Spain. If you (developers) ever want to change or update that, I'm willing to record the voice for a unit or two