The ipatch is a 3rd party product that D.S.-Sama has volunteered to make using the dialogue that I originally intended for the game, but had to change due to Patreon's puritanical rules. DS makes almost no compensation off of it, besides what people have pledged to his
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account. The newest version of the ipatch has been done differently than any of his ipatches up to date, and as such, has come with a few bugs. DS is going through a very busy time in his life, and has not been able to spend every waking moment fixing it, but is aware of the problems and is working on it when he can.
From my own experience, and watching the experience of others, the ipatch works almost exactly as intended, but where the biggest problems occur is when someone tries to install it onto versions where it is already installed, or try to install the wrong version of the ipatch into the newest version of the game.
An incorrect installation of the ipatch, even after you've fixed it, or have deleted the game and re-downloaded it, or even deleted the patch completely, will continue to cause the game to have naming errors. From what I understand, this is due to the way ren'py stores persistent save data, and those errors that existed in an incorrect installation of the patch will persist, even after you've fixed the problem.
Below is the best method I've found to take care of the problem, but requires that you've got the ipatch installed correctly to work. If you're getting the download from the OP of this thread, you don't have to do anything at all. Just download the game and the ipatch is already installed.
The best fix I've found is a bit painful, because you have to delete your saves, and your persistent save data. So, first delete the saves in your "save" folder that you find in the folder named "game". Then go to C:\Users\YourUserName\AppData\Roaming\RenPy and delete the AFV folder. At this point, you have no saves and have to start a new game. Or you can look around on this thread and use someone's save that's already been posted, by placing it into your save folder.
I hope this helps. This procedure also takes care of several bugs that can persist even after you've installed bugfixes, or bugfixed versions of the game.