ok I decided to do something really dumb, and now I need help
I decided to try out undertale Debug mode, but when I went into my steam folder, there were already the things I would need to do the actions. So I'm like "oh cool", so I follow all of the steps to the walkthrough, but apparently you had to create a backup, which I had no idea how to. (Not that I could even do it anyway)
So now when I open up undertale, it says that some file is missing after editing the files to get debug mode.
Someone tell me how I reinstall it please.