Actually the above is a bit incorrect.
The True Edition = fully uncensored game including incest. However, it's possible to remove the incest from the patch by following the optional instructions... so perhaps this is where the confusion came in. ← It includes both, but gives the option of filtering incest for those who simply dislike incest.
The Taboo Edition = partially uncensored game which is mainly incest and some other, less "controversial" stuff (like the addition of dark content).
If you want the game fully uncensored... simply download the True Edition patch and follow the installation instructions. Do not try to install both.