MacRumors published a story that Apple has released the second beta of macOS Sequoia to registered developers.
Apple Seeds Second Beta of macOS Sequoia to Developers
Apple today seeded the second beta of upcoming an upcoming macOS 15 Sequoia update to developers for testing purposes, with the software coming two weeks after the release of the first beta after the WWDC 2024 keynote event.
Registered developers can opt-in to the beta through the Software Update section of the System Settings app. Note that an Apple ID associated with an Apple Developer account is required to get the beta.
