Not much, actually.
The Demo mode is what you download at anytime when you click on the "Download Now" button. You are not going to be asked for any kind of license information when you download the program. If you do not have a license then when ProPresenter opens you can just click the "Try It" button to put it into the Demo mode. While you are using the Demo, you will see our logo as a watermark over the output of ProPresenter. This watermark is applied to the output channel, and not to any of the files. This allows you or your volunteers to create presentations on personal computers without having to use your organization's license on their computers. The demo has no time limit on it.
The Trial mode is the next step from the Demo mode. In order to use the Trial mode, you will need to request a two week trial code. This code is activated as soon as you request it. We recommend that you use the Demo mode for a few days to get comfortable with the program before you request the trial code. After you request a trial code, when you open ProPresenter, rather than clicking on "Try It", enter the registration name and license number from your trial code email. The Trial is active for 14 days and removes the watermark for that time. This allows you to use ProPresenter in a live environment for two weeks before you purchase it.
The Licensed mode or Registered mode is what you have after you purchase a license for ProPresenter. If you are converting a Demo mode, enter the new registration information rather than clicking on "Try It". If you are using the Trial mode, then open ProPresenter, in the top left, click on ProPresenter, then click on Registration. Click on Unregister, then enter your ProPresenter Registration Name and Unlock Code.