Beta software, also referred to as a preview, seed, or release candidate, is a pre-release version of software that’s still under development and not yet released to the public. For complete instructions, read Installing Apple Beta Software
For devices running macOS 13.4 Ventura or later, go to System Settings > General > Software Update > Beta Updates and choose the Developer beta to install this software. Before testing your software on your device, make sure to enable Developer Mode in Settings > Privacy & Security.
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For devices running watchOS 9.5 or later, from your iPhone go to Settings > General > Software Update > BetaUpdates and choose the Developer beta to install this software. Before testing your software on your device, make sure to enable Developer Mode in Settings > Privacy & Security.
To update to the latest beta version of watchOS, use the Watch app on iPhone to update the software.
For devices running macOS 13.4 Ventura or later, go to System Settings > General > Software Update > Beta Updates and choose the Developer beta to install this software. Before testing your software on your device, make sure to enable Developer Mode in Settings > Privacy & Security.
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Install Device Support for macOS 26 beta if installing the macOS Seed in a virtual Machine fails on a host Mac.