If you are having trouble with the standard installation, these peer-recommended methods are often discussed in "good posts" on Reddit and Google Groups: Download macOS Mojave 10.14.6 Combo Update - Apple Support
To download and install macOS Mojave 10.14.6 from Google Drive, follow these steps:
Looking for the macOS Mojave 10.14.6 DMG file? You aren't alone. As Apple releases newer versions of macOS, many users prefer to stay on—or downgrade to—Mojave for its stability and 32-bit application support. Finding a clean installer can be difficult, leading many to search for Google Drive links for faster downloads.
Where to find a download link for Mojave … - Apple Community
If your current Mac version prevents you from downloading older OS installers, you can use