did you just try to install the patch or is this your first time installing?
it looks like it's trying to load the backup, so unless you've tried to reapply the mod or similar (which you don't need to do with my version b/c it's already modded for you), you should be able to just delete the "backup" folder within your main game folder and try again.
I've actually just reloaded all the files to incorporate some bug fixes and a little new content just now, so if that doesn't work, you could redownload the main file, and reinstall per the instructions in the original post
None of those files are necessary, so if it's loading ok, you could ignore the error. These are just versions of the *.gd files the game uses that have been updated per my personal preferences (the Optional ones noted in the instructions).