The way itch has it set up, it doesn’t seem so, no, but the way I’ve done it with other players is you can just purchase just the game again/pay the 5 here or on ko-fi/patreon, whichever’s easier for you, and email me (pdrrook@gmail.com) the receipt/proof of purchase and I’ll send you the pdf that way.
That being said, if you only need the guide because you have an issue reaching one of the endings, I did explain how to get most of them in the comments below, so check that out first and let me know if you need further guidance. Hope that helps!