Developers can download the new watchOS beta
Developers participating in the beta program can pull the latest version via the Apple Developer Center or simply by updating their devices with the beta software. Public beta releases are usually available a brief period after the developer releases, via the Apple Beta Software Program.
The first watchOS 10.4 developer beta arrives after the public release of watchOS 10.3, which occurred on January 22, and its release candidate from January 17.
Go Here to Read this Fast! Apple issues first watchOS 10.4 beta to developers
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Apple issues first watchOS 10.4 beta to developers