Sorry for this late response and thank you for contacting us!
Your license is “PRO Standard” which can be activated on one computer for any number of users.
The license you are referring to is the “PRO Personal” which can be activated on an unlimited number of computers, given that they are used by a single person.
You can find a brief description of each license here: http://www.soulidstudio.com/buy/
However I have increased the maximum number of PCs for your license to 3 at no charge, and deleted the previous activation. You can therefore register your copy of Mosaico on 3 more computers if you so desire.
I hope this proves helpful, please feel free to contact me at any time.