I downloaded a dmg which apparently OS X mounted as a drive or something. Then I googled around to find out I should ctrl+clicked -> open the program and get past the warning messages.
I closed the app, and dragged the .app file to launchpad. Then I ejected the mount DMG and now launchpad can't figure out where the app is. Apparently it just created a link.
How do you install applications on a mac? As a developer I find it hard to believe it could be this complex without the OS offering any helpful hints.