Download the CaptureAge Client. Follow the installer's instructions and launch it. Also make sure Age of Empires II: Definitive Edition is installed. Note: Since CaptureAge is brand new you might get a security prompt from Windows. Check if the publisher is "CaptureAge" and it's safe to accept!
At present CaptureAge only supports the Steam version.
Registering is optional but will make it easier to interact with our future content.
a. Launch CaptureAge
b. Launch Age of Empires 2: Definitive Edition
c. Start watching a live or recorded game
d. Press Alt + Tab to go to CaptureAge
e. Press the button to Connect to the Game