The license, serial number, on the old server will need to be deactivated before it can use it on a new server.  If you do not have access to the old server, F9 support will need to be contact to deactivate the license.

To deactivate on old server:
1.  Open F9
2.  Click on F9, select F9 Server, select Utilities, select License and select Deactivate.
3.  Type in the current serial number and click Deactivate F9.

To activate on the new server:
1.  Open F9
2.  Click on F9, select F9 Server, select Utilities, select License and select Activate.
3.  Type in the current serial number and click Activate F9.

OR

Refer to Knowledgebase solution How to Activate F9 registration.