Project A2

First, download the apk and transfer it to your vr headset.
You can transfer it by a link cable, or directly downloading it in the headset browser.

Oculus way:

Install mobile vr station in the meta horizon store, once you install it, open it, and accept all permissions, then go to "local files", "all folders", "android", "data", then scroll down until you see "scoped storage actions", and now press "step 1 request access" and accept the permission, it should open your oculus menu, in files, then go to downloads, and lastly, search the apk and click the four arrows, press install and wait until it installs into your vr headset.

To open it just click "open" when it stops installing. ENJOY!!
(to open it again, go to unknown sources and click "Project A2")