If you are experiencing a file permission error, refer here - https://support.infinitewp.com/solution/articles/195248-problem-while-updating-infinitewp-admin
Make sure your addons are set to your account by logging here https://infinitewp.com/my-account
Use the infinitewp.com username and password, and not your InfiniteWP Admin panel username and password.
If you do not find your addons in your account, send us a mail at firstname.lastname@example.org
If you need to reset your password - https://infinitewp.com/lost-your-password/