After installation, re-enable automatic date.
If you absolutely must use an unofficial DMG, take these precautions. First, (e.g., MD5 or SHA-1 hash) against a known, official value to ensure it hasn't been tampered with. Second, before opening the DMG, scan it thoroughly with updated antivirus software . Finally, make a full Time Machine backup of your current system before attempting any installation. A corrupted install could wipe your data. macos mojave 10.14 6 dmg google drive