download the file, after that plug your quest into your pc and go into your oculus. click allow to any message that pops up and then take off the headset. and open side quest at the top left of the screen you should see the circle is green and it says connected, and at right of the screen you should find an icon that looks like a box with a down arrow in it. click on the icon and it will open your file explorer after that click the apk file you downloaded. then click open after that go to running tasks (you should see a little 1) and if you click on that it should say its installing. *AFTER - IMPORTANT!* once you go into your headset and into unknown sources it is NOT titled after SAO, it is named: XR VR
Hope this helped -Will