Hey! I tried using your tool, but I get the following error after trying to encrypt the Data folder. (I only want to encrypt that) Any tips what causes this issue? (RPG Maker MZ) 
There may be a dependency json file that's being read by one of your plugins. Also make sure that you're only encrypting once.
Should still work. Just make sure all .jsons are encrypted. If they're housed under a subfolder of the data folder, bring them out temporarily and encrypt the data folder.