The new builds are available to download via the Apple Developer Center by those taking part in the test program, though participants can also install the latest build by going to the “Software Update” facility in System Preferences. The public beta release is typically issued within a few days of the developer version, and can be acquired from the Apple Beta Software Program website, or updated by the same mechanism.
The fifth build of macOS 10.14.1 Mojave is 18B73a, replacing the fourth build, 18B67a.
