Apple has released the seventh beta of macOS Sierra for developers and the six beta for public beta testers. The final version is due this fall.
The developer version can be downloaded from the Apple Developer Center. If you’re not already signed up for the public beta program, you can do so here (http://tinyurl.com/pffuwnz). The public beta program is free, but remember: beta software is unfinished software so use with care.
