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Apple has released the second macOS Monterey Release Candidate beta for developers to test before its October 25 public launch.
The newest builds can be downloaded via the Apple Developer Center for those enrolled in the test program, or via an over-the-air update on devices running the beta software. Public betas typically arrive within a few days of the developer versions, via the Apple Beta Software Program website.
The twelfth round arrives after the last beta on October 18, which was also the first Release Candidate. Apple will release macOS Monterey on October 25, so this is likely the last beta before launch.
The build for the RC2 of macOS Monterey is 21A559, only one digit higher than the previous build.
The list of changes for macOS Monterey includes Siri Shortcuts, AirPlay to Mac, Focus modes, a system-wide Quick Note feature, and Universal Control with other Apple hardware. On app-specific changes, there's Live Text support for Photos, SharePlay for iMessage, and grid views and Spatial Audio support for FaceTime.
Apple has also released an iPadOS 15.1 RC 2 specifically directed at the new iPad mini, but specific fixes aren't known. The build number for this developer beta is 19B75.
AppleInsider, and Apple itself, strongly recommend users avoid installing betas on to "mission-critical" or primary devices, due to the small chance 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.