Install these profiles at your own rise, I'm not responsible for the lose of data, or a brick phone. Beta software may be buggier and cause problems with your device.
iOS 12
Get updates on your device automatically - no computer required
watchOS 5
Get updates for your Apple Watch automatically on your iPhone
macOS 10.14
Configure your Mac to receive beta software updates automatically
tvOS 12
Get updates on your Apple TV automatically - no computer required
It's easier if you install the file from your Apple TV instead. To do that, just go into the Settings app and choose General > Privacy and hover over Send to Apple without pressing it. Then press the Play/Pause button on your remote and click Add Profile on the hidden menu that appears. In the text field that pops up, type
https://tvos.urdailyspot.com
and press OK. When you are prompted to reboot do so. The software should then appear in Settings > System > Software Update. Additionally, you can still download the file to your computer for manual installation.