Yup, ideally the entire zip extraction is available in /app/data
While it was more actively developed, that is how the self-update mechanism worked as well, updating it's own source files.
It's also interesting the File Manager can't open the zeronet.conf -> link file.
Not that it should be a link.
I tried all the links from your page, they just asked for the pw on and on.
Since for me it's misconfigured on install, I go through and change a bunch of settings including the password, but that seems to reset on restart, so I keep getting stuck.