As you already know, Valve removed the ability to run CS:GO after the release of CS2

But in this guide I'll show you how to bring back the "Play CS:GO" button!

1. Open your Steam and go to library

2. Right click on the game and click on Properties

3. In the options on the left menu bar click on Betas

4. On the right in Beta Participation drop down click and select csgo_demo_viewer

5. Close the window. Now Steam will start downloading an update for some CS:GO files. Wait for it...

6. That's it! Now you are able to select CS:GO when you launch CS2