To enable downloading beta Apple operating systems you just need to sign in with your Apple ID on the Apple Developer Center website at least once. You don’t need to join the paid Apple Developer Program, but you will need to accept the terms of the Apple Developer Agreement.
Then, in the headset, navigate to Settings -> General -> Software Update -> Beta Updates and select “visionOS 2 Developer Beta”.
Note that installing a beta version of an operating system is only recommended if you’re willing to accept bugs, instability, and the small chance it could put your device in a state requiring a factory reset. Some apps may even stop working. In exchange, you’ll get to try out the new features and improvements in advance.
