try this before you give up:
1) right-click the link and select "Save As...".
2) then select a folder to save the file.
3) once the download has finished, go to the folder where you saved it (usually it's Downloads folder).
4) open it with a PDF reader (like Sumatra PDF, Adobe Reader etc...).
here's the link to the PPH so you can try now:
(obviously download a PDF reader if you don't have one. I like Sumatra 'cause it's free and allows you to choose the background and font color in the advanced settings, which allows you to turn any PDF into dark mode)
I had success on the first try.
the mistake you guys made was trying to open it inside the internet browser, instead of downloading the page as a file.
trying to open it would work better if the file was lighter, but it's extremely big, so it's better to do like I said.
this is regarding the November 2021 version of PPeH. the next versions may come with different links, I don't know where they'll upload them. maybe this method will still work if the link finished with ".pdf" (no quotation marks)
on phone, I didn't try yet, but I guess it'd probably be the same thing: you'd have to hold-click and find an option to download it instead of open it. then ONLY open it after it's completely downloaded (and use a PDF reader, not your internet browser)
I hope this helps.
go back here to tell us if it worked.