If you are still struggling (and failing) to download the Mojave installer - and still get that same message about updating the settings in your AppleID account - Please go back to my post #7, and try the Dosdude solution. I use that, and refer to it several times a week. It is a usable solution for you.
But, if you still need help, please try to give details about what you have tried most recently. "I still need help..." doesn't provide much information about what is now happening (or not happening!) 😎