Cameron,
We will never override any files that are already downloaded to your folder, no matter the update. The beauty of how our system works is that it will only download content that doesn't exist. If it is already in your Land F/X folder, it will just pull from there. You would need to delete all files or perform a fresh install in order for the system to download our default blocks. We would suggest that you back you files up once you get the blocks set the way you want them, just in case someone happens to delete items within that folder.