Acronis Server and Workstations Licenses

Hello,

Some servers and workstation already installed with licenses 10 and upgrade licenses to 11 but I have the following question:
1. License server showing error that this license not used, How to reassign them again to servers and workstations?
2. How Can I check for the installed license on the server and workstations?
3. I have 11 versions on server and workstations but I still have some remaining workstations license version 10, How Can I use them on license server version 11?
4. I'm confused of using licenses 10 and licenses 11 upgrade?
5. If I revoke all used licenses, how to assign them again to the servers and workstations?

Thanks

Bilal