Wow, thanks for the quick answer! I'll definitely update my installation.
Still, I'll try your workflow, too. Maybe it's a better way to use Dungeondraft. As you can imagine, I'm pretty new to it (and have absolutely no artistic talent nor training). I used it a bit a little while ago to redo Stonehell maps for my Foundry game (the "trace image" was very useful), but eventually went back to Dungeonscrawl when I had a hard time with some things (I had trouble with some wall and door placement, but I'm not sure I remember correctly). With your pack, I'll probably use Dungeondraft again! It's exactly what I wanted and it looks fantastic.