If you click on a system to be updated in the "Software Licensing" feature, you have the option of updating the software licenses for your measuring sysetms under "Request license key". The prerequisite for this is a valid software maintenance agreement.
When you click on "Request License Key", a window will open asking you to confirm that you actually want to update this license.
You will receive an email with the Entitlement ID required for the update. This needs to be entered in the ZEISS License Activation Utility (ZLAU). A detailed description of the procedure can be found here.