To assign the license, perform the following steps:
Navigate to Manager → <Admin Domain Name> → Setup → Licenses.
Click the System tab.
Choose the license that suits your requirement and click Assign.

The Assign License pop-up window opens, click the Assign To drop-down menu and select the Sensor.
Click Assign to assign the license to the Sensor.

Note
In case you are replacing an existing license, a Confirmation dialog-box opens. To confirm license replacement, click OK, else, click Cancel.
Upon successful license assignment, an Informational dialog-box opens stating the license has been successfully assigned. Click OK to close it.
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Note
You must reboot the device for the changes to take effect.