I’m using 4.14.3. After installing the plugin and sample content, I was learning how the themes work, when the editor crashed. Now it crashes any time I try to open the Dungeon Theme editor (even for a brand new project). I think the last thing I did was dock the content browser window at the left of the dungeon editor. I was able to work-around, by resetting the UE4 editor layout. Hope this can be fixed in a future update.