Glad you got it working.
I’ve noticed it need a lot of time to start even with good hardware and the confusing part it’ll throw errors rather than doing nothing.
Now to configure sponsorblock, go to settings > advance > select downloader: choose yt-dlp
Then go to settings > downloader > global custom args type this: --sponsorblock-remove,,all
Now, for all new videos, it will download the video and remove all sponsorblock marked segments.
For those who don’t know what the hell is Matrix: