Font Agent

The free application Font Agent synchronizes rented fonts with the computer on which it is running. Fonts are stored on the web server, so you do not need to deal with font files on desktop. Just start Font Agent and work with fonts in Illustrator, Photoshop, InDesign, Sketch, as shown on the video below.
You must accept the terms of the End User License Agreement.
That's how Font Agent works
If you have already downloaded the latest version of Font Agent that can run it and rent fonts marked with 
Find fonts for rent