The last time I used this was week ago and it's working.
All you have to do is login your account and click on "YouTube" then, wait.
Please, notice that you cann't have the addmefast page and the bot open at the same time.
Sorry, but you need at least 25 posts and 5 hours online time to unlock hidden content.
Some antivirus detect the archive as a virus, here is the virustotal scan https://www.virustotal.com/en/file/403c1.../analysis/