All might not be lost though. I don't know what their reasoning behind dropping support might be but it is open source. It looks like there's a Stardog branch in the trinityrdf repo and it's only 19 commits behind main. The last commit comment on that branch is "removed Stardog support" so that's everything you need to get it going minus any recent changes to trinity and/or Stardog. I'm not a Windows developer or I'd give it a shot.