So far this is the only app/add-on that I've come across that that can pickup and then follow-through with GOG's Offline Game Installer.bins. Because GOG's site is using some kind of Javascript to fetch the actual FTP link, most download managers will save the Parent-link which is only used for holding the most up-to-date game installers. GOG does this so they never have to change that Parent link, they only need to change the content that the Parent link is hosting. When a user right-clicks and copies the link off the page, they'll only get that parent link. Somehow a download manager needs to resolve this parent link and then access the content therein. Anyway, this add-on does exactly that.