I use the free version, (which omg you have to pay for chat/email support!!!!!), and I use this for work. Most of the time I use evernote on my laptop or phone, but occasionally I will use a desktop at work. I was trying to do some updates on my notes and was logging on my Mac and I needed to revoke access. So I chose to revoke the desk top and it prompted to me revoke again while using up one of my allowances. I tried again, and it used it again but still did not log me in! I don't know what else to do besides wait for next month to try again.