on source site there're a couple of problems: (because of a crooked web site programmer)
- some books are displayed incorrectly
- the book should be published no later than 2019-2020, due to change in page structure (for "parsing")
zypper in ghostscript imagemagick on most distros may already be installed by default
and if you want to OCR:
zypper ar https://download.opensuse.org/repositories/home:frank_kunz/openSUSE_Tumbleweed/home:frank_kunz.repo
zypper ref
zypper in OCRmyPDFto start just type ./script --help