I found another Coolreader version, by vlasovsoft
http://pbchess.vlasovsoft.net/en/
It's actually a bunch of apps, Coolreader included. It instantly began working on my Inkpad 2. Differences in vlasovsoft compared to the Coolreader version of this thread:
- No way to open books from the main booklist (there is an internal Open file menu to navigate the directories though)
- No pinch-to-zoom
- The file manager seems to have no search or filtering, so it's annoyingly slow
Otherwise it works and I am keeping it for now.