Hello Helgrin, I am the creator of Pumpkin Eater. Archive.rpa is a ren'py function that prevents people from peeking into the files as to not spoil themselves. Don't mess with it unless you know what you're doing, which is causing these errors.
After you download the game, only click the .exe file, which should start up the game. You can always try to delete and redownload. I am very sorry about the trouble, please let me know if you need any more help.