A nice oneliner to create a fast copy:

wget --mirror --convert-links --adjust-extension --page-requisites --no-parent https://example.com

awk '{gsub(/"/,"",$7); print $7}' access.log

To get the latest 64bit Version of IrfanView running on Ubuntu with wine, without snap - do the following:

winetricks mfc42

Put all pdf's you want to combine in a directory. Name them in the order, you want to combine them.

qpdf --empty --pages *.pdf -- NameOfMergedFile.pdf