In order to unregister the product please follow these procedures;

1. Launch 4D (or 4D Server) on the machine that you want to unregister the product on.
   
   
2. From the HELP menu, choose UPDATE LICENSE...
   
   
   
   
3. From the "Active License" tab click on the "License Folder" button in the lower left corner of the screen.
   
   
   
   
4. A new window should open that contains the licenses on this machine.
   
   
5. Locate the license file that you want to unregister and delete the file.
   
   
6. Empty the trash or recycle bin to complete the process.

After completing these steps the product has been unregistered from the machine.

Note: to remove all licenses, simply delete the 'Licenses' folder.