However, if your Mac is several years old, there’s a good chance that the current version of macOS won’t run on your Mac Apple drops support for Mac models that it declares to be vintage or obsolete. Note: This article was originally written for macOS Mojave, and has been adapted for macOS Catalina.įrom a security standpoint, using the latest version of macOS-the Mac operating system-is always preferred. Software & Apps How to keep older Macs secure: a geeky approach (run Catalina on unsupported Macs)