Macos Mojave 10.14.3 (18d42) -

It is a popular target for "macOS Mojave Patcher" tools used to run Mojave on officially unsupported Macs. Reported Issues & Troubleshooting

This version is no longer receiving security updates and is considered an older legacy release. Key Features & Changes macOS Mojave 10.14.3 (18D42)

While designed for stability, users on some older hardware (like 2012–2015 iMacs with 5400 RPM hard drives) reported slow performance or "beach balling" after upgrading. It is a popular target for "macOS Mojave

Users running this specific build (18D42) have documented several common software and hardware hurdles: Format on Save breaks Template Literal Variables #67989 macOS Mojave 10.14.3 (18D42)