This article will document how to resolve the License exceeded maximum number of users error...

 If you receive the error: License exceeded maximum number of users, this means that you have reached the maximum amount of users for the license you have.

You can have the software installed onto more than the licensed amount of PC's, but only the licensed amount of users can have the software open at any one time. To remove the error and to carry on using the software as normal, the software will need to be closed on any additional PC's.