The author(bendikro/bro), has it on his ToDo-list for if ever finding time for him to implement it(see notion on first page, plus has been requested many times from 2012 to now - Note, no diss to bro whatsoever, obviously, and so wasent meant in any negative way; Thank you bro for all your awesome work and time volunteered, both in vital 3rd party plugins like this, and upstream development!

DragonNick,
If using py3.8.x as installed py3 version(to check, run: 'python3 --version', or 'python --version', sorry, never used Ubuntu myself, so not sure, as varies between distros, or atleast used to), then rename the '3.7' part in plugin filename to instead '3.8'. I don't know why not working when reverting python version back again though, but remember you need restart all deluge daemons and UIs also, after changing something.
I don't know why this is still needed, as said many times, as Cas stated in docs that it's not anymore, but that is clearly not the case. Though obviously I should just have submitted a ticket for that then, which I only first come to think about now honestly. BTW, python docs state that field is optional and is for defining working version when there is compatibility problems between versions. I think it would be great if common concensus would be made among plugin devs to simply omit that field all together, well unless actually specifically needing it of-course, and some select few(one?) already omit it i.e ltconfig latest version, as far as I've seen/noticed, but again, simply just my humble opinion on this
