The screenshot below shows where a user can go to Unlicense their Writer or Reader client.
In PowerOLAP, under Edit - Options - Licensing Tab. Click on the Unlicense button at the bottom.
Reader or a Writer License: After following the steps above to Unlicense, you then you will go through the process of generating a new license on the new workstation.
Designer License: After following the steps above to Unlicense, the same license (ID and password) can then be registered to a different machine.