For connecting Stages Link to Golden Cheetah, please review this article.
Stages Link app
If you are using the Stages Link app to display gearing while riding Golden Cheetah, set the bike to External control on the main screen before you begin.
Bike firmware must be or newer for trainer control to function. Access the bike settings by clicking the cog icon in the upper right corner of the control page and check for firmware updates.
Install Golden Cheetah
If you have not already, download the Golden Cheetah app.
Plug in your USB ANT+ dongle to your computer and safely orient near the front of the bike. It may be necessary to wake up the power meters by spinning the cranks several rotations.
Upon initial opening and setup of the application, a pop-up menu will allow you to pair to your StagesBike. The Train tab is where all connections and workouts are performed.
Select Add Device and pair via ANT+ and FE-C.
StagesBike will default pair as Fitness Equipment Control, the left power meter will pair as Power. Heart rate can be paired as well. The application will read Speed and Cadence from the bike without pairing these sensors, so no ANT+ ID will be shown.
Once the StagesBike is paired, proceed to the Train tab, select the workout that you would like to perform on the left sidebar.
The hamburger icon at the right side of the header will allow you to make several selections regarding workout import and selection.
To workout without a preset workout file, select either of the two Manual Modes.
Use the Intensity Adjustments and Workout Control to begin, end, or alter your workout.