Apple has released the second beta of an upcoming macOS Sierra 10.12.2 update to public beta testers about a week after releasing the first public beta of 10.12.2 and one day after seeding the second beta to developers.
If you’re not already signed up for the public beta program, you can do sign up at .https://beta.apple.com/sp/betaprogram/ . The public beta program is free, but remember: beta software is unfinished software so use with care.