I believe the plugin gallery indicates the definitive versions of plugins - and not necessarily the individual github repository - @asmecher - could you speak to this as well as the issue with the pull request?
The version in the Plugin Gallery is known compatible with your release of OJS. The main branch is currently under active development for release with OJS/OMP/OPS 3.4.0, so won’t work with your installation. I’d recommend sticking with the version that’s recommended in the Plugin Gallery.
The pull request you opened didn’t pass our automated testing toolset; I’ll follow up on the PR.
Thanks,
Alec Smecher
Public Knowledge Project Team