Android 16 QPR1 Beta 2 is live, but a popular installation method remains MIA
It's currently limited to the official beta program and the factory image

Android's Quarterly Platform Release beta program gives Pixel 6 and newer owners the chance to test the latest software before it turns into the much-envied Pixel Feature Drop. Enrolling in the traditional beta program sets you up for automatic installation, but the characteristically gradual rollout means you'll have to wait. You can also flash a factory image to your device, but only if you're OK with performing a factory reset.