I had this issue when I downloaded the 1.87 version from nyaa and then tried applying the combined patch to 1.91 provided earlier. The instructions say to put both files into the patch folder and run the game to unpack it, but doing that doesn't work for me. If I put both in at the same time it patches, but then the game won't run anymore. I put the 1.91 patch in by itself and it updated, allowing the game to run. Then I put the debug patch in the patch folder and ran it again, installing that. However, after doing this the game shows the version as 1.89 on the title screen and 1.87 on the window bar and there is no debug enabled.
So I'm a little confused. I'm wondering if the patch to 1.91 provided before is assuming we're on 1.89 already, and that applying it to 1.87 or earlier just screws up the game.
Just put the patch 1.91 under "patch" folder (with ver txt) on the 1.87 (or even older), there's no 1.89v, after you run the exe it will patch and you are done, both of the patch you can find in teh post before cointain the 1.91 so not need to apply both, just choose if you want have the debug option or not.
As now there's no much difference from the previous version, on the gameplay you will unlock the possibly to gag and blind her with strength options (you have before tie her hand or she just will remove it few moment later), as newcome is the new path of the city of the "violence edition" but other than visit you can't do nothing.
For who have problems with "new game" error you have to skip the intro (you can watch it but can't go further for merge problem).
For who is interested about translation: "Memory", who is doing the translation, is busy with learning Unreal Engine so no new patch for now.
For the game update itself check ci-en, right now he is a bit busy with chinese translation but should not be further delay.
This should be enough for reply mostly of the questions.