I've tried downloading multiple pdf readers, nothing's working
Hi!
Have you a different device to open the PDF? I also recommend re-downloading it just in case it got corrupted in transit.
Please keep in mind that it's a 539mb file, so it may not open on some budget tablets or phones, or it may take longer than expected to load.
As an extra step, I did verify the integrity of the itch.io file and it appears to be working