Apple on Friday released macOS High Sierra 10.13.5, the update that adds support for Messages in iCloud. The update comes a few days after Apple released iOS 11.4, which also features Messages in iCloud support, among other features.
The macOS 10.13.5 update is 2.12GB and will require you to restart your Mac. Before you install the update, it’s always a good idea to first perform a backup of your data.
To install the update, launch the App Store app, then click Updates. If 10.13.5 does not appear, try reloading the Updates page by pressing command-R on your keyboard.
