I've solved the problem, kind of...
I unpacked the pk4 files in the base directory and after 20 or some texture files (i think that were texture files) that were not extracted (maybe they were corrupted or maybe my winrar is a little bit old), 3 Gb total size of the game, finally is loading.
I am wondering what will happen when I will encounter the level(s) that needs those texture files: will crash the game or simply I will not see some of the textures??
I hope that I will be able to continue the game with this. Sorry, but the frightening feeling of the game is what is keeping me playing.
I didn't apply the patch, for the record.
Btw, I am a little repetitive as well, with this I :D