PROJECT ASTRO NEW

CX FILE EXPLORER WAY:
so you download the file and then you open cx files explorer and hit downloads then all you do it look for Project Astro and click it and press install

MOBILE VR STATION WAY:
so you download the file then open mobile vr station click local files then all folders then android then data then scoped action settings then request access, you will be brought to your files then you click your quest in the top left and then hit downloads when you in downloads look for Project Astro when you find it click the button that looks like a zoom in then click install and wait for it to download 

Hope this helped :)