You do not need to manually update your Pax Termlink, this update is handled by Finix. However, you can follow these steps to confirm that your Pax Termlink has updated.
By swiping down from the top of the screen on the terminal you should see the following screen:
If you do not see the above screen, please contact Finix Support to help you update your Pax Termlink. If you see the above screen, you can confirm that your Pax Termlink has updated.