Do you need a full Mojave installer or just the .4 update?
If the latter, here ya go.
https://support.apple.com/kb/DL1996?locale=en_AU
If you need a full installer, that’s a bit trickier. By now, I’d have thought most people using Macs have worked out how Apple rolls in terms of OS releases via the Mac App Store. It’s not that hard to download a full copy of the .0 installer when it’s released and keep a copy on hand. Then it’s just a matter of installing the point combo update and you’re all good.
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