Apple today seeded a new beta of the upcoming macOS 11 Big Sur update to its public beta testing group, allowing non-developers to give the software a try ahead of its public release this fall. The third beta release for public testers comes two weeks after the second beta, and a few days after seeding the sixth beta to developers.
Beta testers who signed up for Apple’s beta testing program can download the macOS Big Sur beta through the Software Update mechanism in System Preferences after installing the proper profile. Though labeled as the sixth beta, this is the third beta that Apple has provided to public beta testers.
Mac users who want to be a part of Apple’s beta testing program can sign up to participate on the beta website, which gives users access to iOS, macOS, watchOS, and tvOS betas. Potential beta testers should make a full backup before installing macOS Big Sur, and it may not be wise to install the update on a primary machine because betas can be unstable.
macOS Big Sur introduces a refined design for the macOS operating system, which is more similar to iOS but immediately familiar to Mac users with tweaks to window design, color palette, app icons, system sounds, menu bars, and sidebars.
Read more at MacRumors.com

