Good luck. You’ll need to find a trusted peer who preserved the original 10.14.1 installer from 2018. Share SHA-256 hashes before running anything.
Never execute an unknown InstallAssistant.pkg or DMG downloaded from a non-Apple domain. Old macOS versions lack recent security updates, making them vulnerable to exploits like (a zero-day in ImageIO). If you install Mojave today, do so on an offline machine or a secondary partition. Macos Mojave 10.14 1 Dmg Download
If you are searching for a , you likely need the raw image file to mount on a virtual drive or write to a USB stick for a bootable installer. Good luck
If you are already on a newer version of macOS, you can try to fetch a specific version using the softwareupdate command: softwareupdate --fetch-full-installer --full-installer-version 10.14.6 (Note: 10.14.1 specifically may not be available as a full installer through this method anymore) . Never execute an unknown InstallAssistant