You can create the folder structure that it needs ... in other words, if you last used a runtime that existed on your D: drive, and named it "Victoria 3", create the folders D:/Victoria 3/Runtime And beneath that, add the Geometries, Libraries, and Textures folders And then beneath the Libraries folder, add the typical library categories. You don't have to put anything in them, just add the folder structure and then Poser should be happy again.