where can we find the complete Mojave 10.14.6 dmg file

How to get old versions of macOS

And for the record - Mojave will not come as a .dmg file but will come as a Application placed in the Applications Folder. Once it is run and installed - the application will remove itself

👍

Yes it is an app: Install macOS Mojave.app and I have it stored (along with all the security update dmgs). Build 18G103.

If you need to use it keep a 'master' safe off-site and just use a copy to do the installation/upgrade for as P.Phillips says it is likely to self-destruct.

(All) Links to the updates are at https://en.wikipedia.org/wiki/MacOS_Mojave

[Edited by Moderator]