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Apple on Wednesday released a fourth developer beta of macOS 10.14.2, an upcoming update for owners of macOS Mojave.
The software, build 18C52a, is available through Apple's developer portal, or else through macOS' native Software Update tool. In both cases people must be registered Apple developers and use the correct profile.
It's not yet clear what if any changes have been made. Past betas have included no significant feature changes, suggesting that Apple is concentrating on bugfixes and security improvements. The third beta was seeded just shy of two weeks ago.
AppleInsider and Apple itself strongly caution beta users against installing the software on "mission-critical" hardware, due to the potential for data loss among other possible issues. Even on secondary hardware it's recommended that testers perform regular backups of any important data.