We have a separate guide on How to Import overlay in OBS.
For this tutorial we are going to be using our Animated Retro Twitch Overlay Package as an example.

1. Extract files from .ZIP
   
   • Windows: Right click .zip file and select ‘Extract All…’ and select where to extract the files.
   • Mac: Double click .zip file will extract the files to a new folder matching the zip files name.
2. Click on the settings gear icon in the bottom left-hand corner.
3. Click on ‘Scenes Collections’
4. Click ‘Import Overlay File’ and select the .overlay file located inside your stream package.
5. Now you will see all the scenes are loaded into StreamLabs!

You will still need setup alerts, webcam, audio and your gameplay or desktop capture.
We hope to have a guide for those soon.