I implemented a fix so you can open your save again. If you want to continue to play without the mod (or honestly even if you do, things have changed quite a bit) you have to delete the surface arrakis in the editor. There is not much I can do about that because some stuff is stored in the properties of the surface and it tries to access the mod even if it is not installed. After deleting the surface you should be able to play your save again with or without the mod.
