Hi, is there an error message you get when it fails patching?
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I went ahead and triple checked, and everything still works fine for me. Here are some steps/questions I have:
Make sure you have the latest version of the game downloaded from the official Itch page, ideally not through the Itch app. Same thing with the latest version of the mod on my page.
Make sure you have Delta Patcher V3.1.5 from the correct GitHub page. I have not tested the newest version.
Make sure all folders are unzipped: The patcher, mod, and game.
Make sure the game file is on the top row when patching and the patch file is on bottom.
Finally, which operating system are you running? I have never tested the patcher on Mac in case there is a problem there.