This is a Pro Feature
To download the Desktop Player, open up a presentation first. Next, click Actions at the top left. Then, select Install Desktop Player from the drop-down menu. Under Present Offline, click Install Desktop Player. An export window should appear. Select OK and the application will begin to download. Note: The export will automatically detect if you are using a Windows or Mac OS.
Once downloaded, click on the .dmg file in your downloads folder. Drag the file into your Applications folder:
You will be prompted with a message about the app. Click on Open to run the app: