1. When setting a field for entering the serial number, either remain empty, or generated by the attached NI License Activator: Options-> Generate Serial number
2. After the installation is complete (both Labview itself and any of the toolkits), restart the NI License Activator, and if not, then Option-> Refresh. Find the desired item (When activating the "Professional Development System" version, you must also activate the "Application Builder" module), right-click the context menu and Activate in it.
3. The result of successful activation is a green box in front of the activated component / toolkit in the list of the Lisence Manager