Due to Oculus limitations, downloading environments requires the installation of a separate app "Moon VR Home Installer" on your headset.
Go to Oculus Developer Center, sign up to be a developer, create an Organization, then verify your developer account.
On your smartphone or tablet, in Meta Quest app, go to Menu > Devices > Developer Mode and turn it on.
On your headset, go to Settings > System > Developer and enable USB Connection Dialog.
Connect your headset and computer with a USB-C cable, and allow USB debugging on your headset.
Download 'Moon VR Home Installer' apk and install onto your headset via Oculus Developer Hub.