Passthrough, MetaXR, and the original quest headset.

Here it says the MetaXR plugin has now being migrated to work with UE 5.3.1 - yet I can't seem to get it working there. I have the plugin installed and enabled, I have the project set to "start in VR" as well as "auto entry" in the editor settings - but still, whenever I go to run my build on my headset, it remains inactive in windowed mode - OR WORSE just quits back out.

https://developer.oculus.com/downloads/package/unreal-engine-5-integration/

Lemme guess, this isn't going to work with my original black chunky boi Meta Quest headset from 10 years ago?

If that's the case, what Unreal Engine and MetaXR or OculusXR plugin should I be working with? What SDK/NDK/Java versions should I be working with? Are there any helpful pages for legacy developers like myself?

P.S None of the links for Meta's Unreal Fork I've found are working.