I hadn’t used it until the past weekend, but I wanted to go play some games at a nearby internet cafe, but didn’t want to sign onto any personal accounts while there. I downloaded the offline installers for a few of my GOG games to a USB flash drive, and took that with me. The games installed very easily and I was playing my games pretty quickly without having to sign into Steam on a computer I didn’t fully trust, and/or wait for the download. Going forward, if GOG and Steam have the same game, I will buy on GOG, and save the offline installer somewhere off their platform.