ePUB downloaded ok any options to install so can read ?
The PDFs unable to downloadable
https://doc.opensuse.org/documentation/leap/startup/book-startup_color_en.pdf
The requested URL was not found on this server. The link on the referring page seems to be wrong or outdated. Please inform the author of that page about the error.
If you think this is a server error, please contact the webmaster.
doc.opensuse.org
Apache/2.4.51 (Linux/SUSE)
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To read epubs, install Calibre. It’s viewer can handle epubs just fine. 
To install Calibre I recommend following the instructions on the website calibre - Download for Linux
Download for Linux
The latest release of calibre is 6.21.0. What’s new.
Please do not use your distribution provided calibre package, as those are often buggy/outdated. Instead use the Binary install described below.
Binary install
calibre has a binary install that includes private versions of all its dependencies. It runs on 32-bit and 64-bit Intel compatible machines. To install or upgrade, simply copy paste the following command into a terminal and press Enter:
sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin
While you wait for the download to complete, please consider contributing to support the development of calibre.
I’ve been doing that for years, and it works great. If you like it, be sure to do the last step.
Was able to downloaded the PDFs a few minutes ago,
my thanks to the team
crmrhm thanks for that info, will take a look at Calibre again, am remembering that used it previously.
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I would not recommend to a person that needs help to view epub files (we all start somewhere!) to pipe an installation script into sudo sh.
There are safer alternatives :
Please do not run wget … | sudo sh unless you know what you’re doing.
