You can manage what devices are using active seats of ProPresenter from the Renewed Vision Account Manager. You will need to be logged into accounts.renewedvision.com and then click on "Manage Bibles"

Once you are in the Bible Management screen, you will click the three dots next to the Bible you wish to manage and choose "Deactivate"

Once it is deactivated from the Account Manager, you will need to install it on the new computer you wish to use it on! You can learn more about that HERE