How to get a standalone installer for Mojave?

GustavoPi wrote:

I have now Catalina in my MacBook Pro 2012. I am aware is not elegible for the next system, but Catalina have several disavantages for me now, it' slower, unstable, full of glitches and won't run 32 bit apps. I won't work with Catalina anymore, and my first choice is Mojave.

Just to be clear - I dont want to polemize the subject, Catalina is not good FOR ME. And I am trying since .0 version, so this step is done, I will leave Catalina no matter what.

But I can't find an installer. many post have this link: How to upgrade to macOS Mojave - Apple Support that have a link of Mojave that will open the System Preferences and lead to an error, the same as to try to find it in App Store. It seems to be available only as update, but I need the standalone installer to a clean install. How can I get it?

Even running Cataliana on your MBP 2012, you should have access to the installer from termianal.

Try the download from the Terminal.app, copy and paste:

softwareupdate --fetch-full-installer --full-installer-version 10.14.6

then proceed... How to create a bootable installer for macOS - Apple Support

Creating the USBinstaller, you then will have the ability to boot from the USBinstaller>Disk Utility> to erase/format/initialize the internal HD/SSD, before you an succesfully reinstall the older Mojave. Restore your user data form a backup.