Strange the mixed experiences of getting this to load correctly. I am also having issues getting this to load, despite having used a previous iteration without issues on my 1.9.17 firmware.
I have been careful to follow the installation instructions correctly unzipping the two files to my .kobo directory, and noticed the kobo upgrading itself as it should.
I have then powered up the kobo without my sd card inserted and gone in to one of my epub books.
Unfortunately I then notice no indications the plugin having loaded, upon returning to my home page.
I had previously sideloaded my 2.1.5 firmware, so to try and remedy the issue I have tried doing a factory reset and let the desktop app upgrade me. I then re-installed the plugin, but to no success.
Any other suggestions? The plugin looks fantastic and I'd love to get it working.