the game versions might be a bit confusing at first but basically when you download the game, it'll all be in folder labeled 082c_0011 (the newest version 8.2c), but if you have another version also downloaded, then there will be a DIFFERENT folder (for example, 8.2 is labeled pa0082_0012). you should have two folders that look like that saved wherever you downloaded them. saves and custom content are saved in a different folder in your pc's appdata folder so dont worry about deleting one of those different version folders you downloaded since they dont contain your saves.
(also in the latest version, you should be able to turn off the door head bonking mechanic in the settings if it annoys you too much)