The ProPresenter software has different license types. SMC purchased a site license which only allows for the license to be activated on 1 computer at a time. In order to run the software on another PC you must first unregister the license on the computer where it is currently registered. Only then will you be allowed to enter the license number below to register the software somewhere else.
Unregistering a Computer
Please click this link. This will take you to a knowledge base article from Renewed Vision, the makers of ProPresenter, on how to complete this process.
License key for ProPresenter software on PC or Mac
Also included here is the license number for ProPresenter for easy access when registering the software on a different computer.