Option 1:
Update a management server to at least UR2
Open a Windows PowerShell Console (with elevated rights) and load OperationsManager Module: import-module OperationsManager
Set the license without connecting to SDK: Set-SCOMLicense -ProductId “yourlicensekey“
Restart SDK Service
Option 2:
Set the date on a management server back to a date where the environment was still funtional
Start the Operations Manager Shell and set the license: Set-SCOMLicense -ProductId “yourlicensekey“
Restart the SDK service.
Option 3:
Disaster recovery:
http://technet.microsoft.com/en-us/library/hh531578.aspx