https://wccftech.com/download-watchos-8-rc-without-a-developer-account/

You can download and install watchOS 8 RC on your Apple Watch without a developer account with Apple and it only takes a few minutes, too.

We are quite certain at this point that you are more excited about iOS 15 and iPadOS 15 than watchOS 8. Makes sense too, but if you are one of the few who absolutely love watchOS 8, like us, then you can take the RC version for a spin without a developer account with Apple.