To install the watchOS 10 update, developers will need to open the Apple Watch app, go to the Software Update section under “General” in Settings, and toggle on the watchOS 10 Developer Beta. Note that an Apple ID linked to a developer account is required.
Once beta updates have been activated, watchOS 10 can be downloaded under the same Software Update section. To install software, an Apple Watch needs to have 50 percent battery life and it must be placed on an Apple Watch charger.