You must download the installer on a compatible Mac. If your Mac is too new, the App Store may prevent the download. Apple Support Official App Store Link: direct link to macOS Mojave on the Mac App Store. Alternative for Older Macs: If the App Store link fails, Apple Support
macOS Mojave 10.14.4 was widely considered a "sweet spot" for Mac users, often described as the last version of the "classic" Mac experience before Apple moved toward a more iOS-like locked-down system. The 10.14.4 "Sweet Spot"
Downloading the MacOS Mojave 10.14.4 ISO file is a straightforward process. Here are the steps: