After installing SideQuest to the pc or Mac, you then connect the headset via usb. Then open SideQuest and let it connect to the headset...it'll tell you at the top left of the window. Once it's connected and green lighted, you select 'Apps' on the left side, then scroll down to 'SideQuest Launcher', and select to install. Once installed, it'll tell you it's done. Disconnect headset, then do a reboot of the headset. After that, SideQuest launcher's available through Unknown Sources.