Currently Apple is testing updates to all of its major platforms and is in the process of releasing them to developer beta versions prior to public release.
Today Apple officially released the fourth beta of the upcoming updates iOS, tvOS and macOS High Sierra to developers and publicly. In addition, the third beta version of watchOS has been released. All updates are minor and aimed at fixing bugs. At the time of this writing, no new features or changes have been found in them.
Apple released public beta versions immediately, with final release expected next week.
To install iOS 11.4.1, go to Settings -> General -> Software Update and follow the instructions on the screen.
To download macOS High Sierra 10.13.6, go to Mac App Store on the Updates tab and select the new version.
To update Apple Watch to watchOS 4.3.2, they must first be charged to at least 50%, connected to a power source and to iPhone. After that, go to the application Apple Watch on your smartphone and install the update on your watch.
To update Apple TV to tvOS 11.4.1, you need to connect it to your computer, and then install the update through Xcode. If you have Apple TV 4th or 5th generation, you can use auto-update.