If you are upgrading the product, the "User Entered Key" option is available by default. The wizard retrieves all the license keys installed earlier. If you choose to use the 5.x license keys, only the product options available for the entered keys are selected and allowed for installation.
While repairing the product installation, licenses can be managed only if "Keyless" license option was selected during the installation. You cannot manage the licenses, if the license option selected was "User Entered Key".
If you are installing SFW Basic, a basic license key is installed by default. Keyless option is not available in case of SFW Basic installation. Using the Windows Add/Remove Programs you can change the option to Keyless or User Entered Key. If you choose the Keyless option, the product installation changes to SFW. After selecting the Keyless option, you cannot revert back to SFW Basic.
Similarly, in case of SFW HA, if you make any changes to the licenses, you must restart the VCS High Availability Engine (HAD) service for the changes to take effect. To start HAD you must enter the required licenses and then run the hastart command or manually start the service.
If you remove all the licenses, the vxsvc service fails to start and the service recovery options are changed to "Take No Action". To start the service you must enter the licenses and then manually start the service or change the service recovery option to "Restart the Service".