If you go into the Twistedworld/game/scripts folder and open the scripts.rpy file in your prefered plain text editor (like notepad for example), you can change "define uncensor_patch = True" to "define uncensor_patch = False" right at the top and it will disable the incest patch. It is case sensitive, so make sure the only capital letter if the F in False.for me, it changed to incest patch as soon as i used the update. which sucks because, belive it or not, incest is a major turn off for me. so i had to dance between 4.0 and 4.2 to get around the incest text.
For anyone else that does want the incest, you don't need to download anything, you can just change that line to True. That's basically all the downloaded incest patch does anyway.