I do have the VX Ace RTP.
I can play the game without the patch just fine, and I can play my other VX Ace RPG Maker games just fine. I also unpack my games with the japanese local setting on.
So not really sure why when I use the decrypter, move the .rgss3a to a different folder, put the extract result folders in the main folder and then apply the patch the game breaks.
I guess I will try reinstalling the rtp and see if that helps.
Edit: Nope, reinstall did not work. Also it seems that installing the patch is what causes the game to break. Cause I can extract the .rgss3a file, move the Data and Graphics result folders to the main folder and run the game just fine (just untranslated) yet applying the patch breaks the game.