mac os 10.14 where to download?

Plus, I have Mac OS Mojave 10.14.1 and 10.14.6 dmg, but when trying to install I get this message:

Those are updates for 10.14. You need 10.14 to update with one of those.

You need the upgrade which I linked to, above.

If it says it is damaged, try deleting it and download again.

That is the only place you will find the Mojave installer.

You must search the Apple support site for "upgrade to macOS Mojave" One of the links should be this one: How to upgrade to macOS Mojave - Apple Support

This is the only one way to get latest updates on my mac.

10.14 is not the latest updgrade. Catalina (10.15) is the current upgrade. It can be found in the App Store.

It's not our website. We don't work for Apple nor own this domain. We're just users like yourself.

You can't download macOS Mojave 10.14 anymore, but you can download the latest version of macOS Mojave 10.14.6 here: How to upgrade to macOS Mojave - Apple Support

For the best features and security, you should upgrade to macOS Catalina 10.15.5, which you can do here: How to upgrade to macOS Catalina - Apple Support

Okay, but have you tried downloading it again using the link provided on Apple's support website? Older versions of macOS Mojave 10.14.6 might not have all the security updates that the current build has.

How to upgrade to macOS Mojave - Apple Support

Apple doesn't provide a .dmg installer for macOS Mojave at this time, you need to download it through the App Store. Try this direct link to the Mac App Store: https://apps.apple.com/us/app/macos-mojave/id1398502828?ls=1&mt=12

If this still doesn't work, you can upgrade to macOS Catalina using Internet Recovery, but not macOS Mojave. If you'd like to upgrade to macOS Catalina using Internet Recovery, restart your Mac, then hold Option+Command+R while your Mac is turning back on. Then reinstall macOS, but don't erase your disk.

Don't use a .dmg file to install macOS; use the .app file provided when downloading from the App Store. If you have an installer, you should move it to the Trash.

Never install macOS that isn't downloaded directly from Apple.