Rename plugin filename to not have '-py*.*' in it. I'm not sure that is the issue even, as not on my computer now, but a few plugins still need that, despite deluge fixed to shouldn't be needing that anymore since 2.0.4+, though there's a specific python call, which when used unfortunately negates that fix, so still prevails albeit only select few affected.
I can't remember but it does state support web-UI atleast.
Last, little untasteful honestly(bringing up another project in a projects support thread, or maybe is just me
), but newest autoremoveplus code, is in our own basher's fork, combining best of the two most popular forks(tote94/springjools) - links a few posts up etc. Figured doing you a disservice not atleast mentioning that, because of form correctness considerations, and especially since OP here seemingly not active for years anyway. I know that version works in web-ui atleast, as checked that specifically yesterday, when testing something unrelated.