It won't allow the PDF to open. Any advice?
EDIT: If you still don't get it to work, after having verified your purchase, I can send you the PDF per email, but I'm guessing it might be a software problem on your end?
I've checked it twice, and even re-downloaded it after upload: everything works.
Your PDF filesize should be around 12.7mb after unzipping? Can you open other pdf files?
PDF opens for me on macOS's Preview.app, Foxit PDF PhantomPDF on Windows and on Moon+ Reader on Android. Try to re-download archive.