Apple today seeded developers with the second beta of macOS 10.13 High Sierra for testing. This comes more than two weeks after releasing the first build to the same audience. If your Mac is registered to receive preview builds, head over to the “Updates” tab in the App Store and check for updates. There, you’ll find the new build ready to install. Just click the “Update” button next to the macOS High Sierra 10.13 Beta 2 listing and restart your Mac. The process may take a little while, so be patient and don’t turn off your Mac manually if you don’t have to.
We’ll update this article with any changes made in the second preview of macOS High Sierra.