https://archive.org/stream/CatholicProphecy/CatholicProphecy_djvu.txt
This was published in the early 1970’s, I have the actual paperback. I could never have conceived of two popes, but there it is.
From the first page:
“Civil wars rage in Western Europe. The Church is perse-
cuted; the Pope leaves Rome and dies in exile; an anti-pope is
installed in Rome; the Catholic Church is split, leaderless and
completely disorganized. Communism is victorious. The Mo-
hammedans invade Europe and commit innumerable atroci-
ties. “
Yes, Catholic Prophecy by Yves Dupont is a great book.
It is a brief, just over 100 pages, but does a great job of compiling Catholic prophecy in one place.
The book seems to be holding up well these days, so it's worth reading if you want to know what's coming (not everyone wants to though).