If your Mac is compatible with Mojave, you can find it on the Mac App Store .
Since Apple provides a .app installer, you must manually convert it to an ISO using the if you need it for a virtual machine: How to download and install macOS - Apple Support Macos Mojave 10.14 4 Iso Download
To run macOS Mojave 10.14.4, hardware must support Apple’s graphics API. If your Mac is compatible with Mojave, you
If you’re trying this yourself: beware firmware locks, verify checksums, and always back up. But know, too, that reinstalling an older OS can be less about technical necessity and more about finding a familiar rhythm in the small, deliberate motions of a machine you once knew well. and always back up. But know