Sometimes the licenses file may get deleted, the disk may get reformatted, or the operating system may get reinstalled. In such cases, the licenses will be removed from the computer. To reinstall the licenses, the computer name must be the same as the original name for which the licenses have been issued. Then you can use License Administrator to reinstall the lost keys.

1. Open the License Administrator (hkey)
2. Select File -> Install Licenses
3. Log in
4. In the dialog click on the "Licenses" tab
5. Select the checkboxes for the licenses that you want to reinstall (this table lists all the missing non-expired licenses that match your computer name)
6. Press Install button

This should reinstall the selected licenses on your computer. If you don't have the internet connection, you will need to reinstall the licenses by manually entering the keys.