Well you can try to revert to an older patch. Patch wise you can always do it, but if the save format has changed your characters would cause issues.
I almost always keep old patches up and they are pretty consistently named. You would just need to highlight the path of the current patch, type that in, and change the number to which ever patch you want to download.
Depths of Peril, Kivi's Underworld, Din's Curse, Drox Operative, Zombasite, Din's Legacy, & Drox Operative 2