1. Drag the BS Patch.xdelta file to the top path (or browse for it)

2. Drag your backed up version 1.4 Beat Saber APK in the "File to Patch" location (or browse for it)

3. Choose where you want to save it, then click "Apply Patch." You can now continue following the guide in

Downgrading Beat Saber On Quest Guide

FAQ

I'm getting a "app is damaged message when trying to open"

This is due to OSX not allowing apps outside of its own store by default. Open up terminal, type xattr -cr , press space and then drag the BSQuestDowngrader.app from your desktop onto the terminal window.

You should be able to run it now. You might need to right click (or CTRL + Click) on it and click "Open".

You may also see it in your Mac settings as blocked here and can choose "allow" if you're still having issues