Downgrading rift games

1. Search the game you want to downgrade

Search {gamecode} in the search box at the top right corner.
Click the details button on {game}. Make sure that {game} is for your headset (Rift and Rift S apply for Link and Air Link as well)

2. Download the desired version

Scroll down and click on Versions. Then click the download button on the version you want and follow the provided instructions

Congrats. You now downgraded your game
If you need help join the OculusDB Discord server and ask for help there.