I’m sorry to hear that. There is nothing in the new version of the app to delete LUTs (in fact, there is no code at all in the app to delete LUTs). On iOS, if you delete the app, then iOS will delete the LUTs and any other app data, but that’s not something that happens when deleting apps on the Mac. Unfortunately, I cannot explain why this happened to you. If you are able to determine the cause, please let me know and I can try to figure something out.