The "Download failed. Unauthorized" message
If you're trying to update a plugin and receive the message "Download failed. Unauthorized", first make sure your license is active.
If your license is active, then the problem is likely that you are running on a testing site and haven't activated the license on a non-test site yet.
A test site is a site that is running on a local development computer, and has "debug", "testing", and similar words in the domain.
If this is the case, please contact support with your test site URL, and we will activate your URL manually.