Apple is on its seventh round of developer betas for its roster of milestone operating system releases, kicking off the round with the seventh beta of watchOS 7.
The newest beta versions can be acquired from the Apple Developer Center by participants in the Developer Beta program, or as an over-the-air update for devices already using the betas. Public beta versions arrive within a few days of the developer versions, accessible via the Apple Beta Software Program site.
The seventh generation of betas take over from the sixth round, which included iOS 14, iPadOS 14, tvOS 14, and watchOS 7, but not macOS Big Sur on August 25. The fifth round took place on August 18 for the same operating systems, August 19 for macOS.
New betas for iOS 14, iPadOS 14, tvOS 14, and macOS Big Sur were not released at the same time as watchOS 7's new build, but are expected to arrive soon.
AppleInsider, and Apple itself, strongly recommend users don't install the betas on to "mission-critical" or primary devices, as there is the remote possibility of data loss or other issues. Instead, testers should install betas onto secondary or non-essential devices, and to make sure there are sufficient backups of important data before updating.