Hi! I'm having the same problem with the keys "missing" when i'm sure i put the file in the ztools folder correctly like the previous versions.
I don't understand how you fixed this issue. Where is this user folder you mention? How do I create a folder ".switch", windows wont allow me to
For example: C:/Users/yourusernamei/.switch
Just take your prod.keys file and place it in there. Or rename your previously working keys.txt file to prod.keys and put it in there.
That said, I'm sticking to the original version. Error messages are not good in the mod for troubleshooting. The original version will say something like "Exception: read returned empty 0x37325c000" when verifying a file, but the same error for the updated "mod" version only says "INCORRECT".