Launch the PowerShell console, and Run as Administrator:

Import-Module OperationsManager
Set-SCOMLicense -ProductId "XXXXX-XXXXX-XXXXX-XXXXX-XXXXX"
Start-Sleep -s 10
Restart-Service healthservice, omsdk, cshost

Don’t forget, in order for the Product Key to be applied, you will need to restart all SCOM Services, (or you can run the code above (there is a 10 second delay after the key is applied before the services are restarted)):

• Microsoft Monitoring Agent (healthservice)
• System Center Data Access Service (OMSDK)
• System Center Management Configuration (cshost)

Cheers!