As you probably know Apple Watch new OS is currently in beta which means only Apple developers can install WatchOS 2 beta 1 on their Apple Watch devices..
The installation is fairly arduous and time-consuming, but it can be done with relative ease if you have the patience. This may be due partly in fact to demand on Apple’s servers so close to the end of the keynote.
Right now I am going to show you how to install WatchOS 2..
STEP 1: Unpair your iPhone and Apple Watch, if you don’t you’ll need to reset your Apple Watch later and repair it. I personally prefer to reset my Apple Watch to defaults anyway. It’s nice to start with a fresh install for a beta.
STEP 2: Download and install the iOS 9 beta on your iPhone from the Apple Developer portal.
Step 1: Pair your Apple Watch
Step 2: Charge your Apple Watch do that it has at least 50% charge and keep it connected to its inductive charger throughout the installation process
Step 3: Connect your iPhone to Wi-Fi
Step 4: Place your iPhone next to your Apple Watch
Step 5: Download the watchOS 2 beta Configuration from the Apple Developer portal directly to your iPhone
Step 6: Launch the profile, tap Apple Watch as install location and reboot when asked
Step 7: Launch the Apple Watch app on iPhone
Step 8: Tap My Watch → General → Software Update
Step 9: If requested, enter your passcode
Step 10: Wait for the Apple logo to appear and watch the progress bar fill in completely
Step 11: Your Apple Watch will reboot once the update is completed