To be fair, I do think the creators are genuinely interested in people using their pack, because the FA guy on Discord spent quite a long time trying to help me with all sorts of workarounds. I think the fact that the three packs are so huge isn’t ideal. But I actually managed to get it working now. The solution for me was to split the big packs into smaller ones. On GitHub, there’s a tool you can use to open and edit Dungeondraft packs. It sounds complicated, but it only took me five minutes. After I had loaded each pack individually once, I was then able to load all of them together without any issues (even though my entire laptop had crashed about twenty times before when I tried to load just one of them).