Hi Vendicagiusti,
sorry, that I read your post after 3 days, but we are a little bit inactive.

The Sacred Veteran Mod changes only 2 files (creature.pak and balance.bin). The mod changes the files only temporarily (before starting the sacred.exe) and restores the original files after playing.
Both files are different between the versions and the languages. If you could provide your files, we would have a good chance to adapt the veteran mod for the italian version 2.28. But I can't promise that it works.
Best regards,
Ufo