Solution
On NI License Manager 4.7 and below, it is not possible to run a command in the cmd to deactivate a product. To deactivate a license in the NI License Manager you will have to manually follow these steps:
- In the NI License Manager, click the Local Licenses section.
- Select the product you want to deactivate.
- Right-Click and select Deactivate.
- In the Deactivate dialog box, click Yes.