It is published in the directory. This is the link: https://moodle.org/plugins/view/block_massaction . Later, I'll try uploading a new version because I do remember seeing something about an error with AMOS in the past, but I never paid any heed because I didn't know what AMOS was, it didn't stop me from uploading the new version, and I had a lot on my plate at the time.
Thanks, David!
Clem
