Download Mojave on a non-Mojave suitable computer I want to do a fresh install (and SSD upgrade) of Mojave on a mac-mini that currently runs Mojave, but whose performance is so horrendous that it is barely usable1.  Easy .. just download Mojave and create a bootable installer and I'm off to the races.

However, the system that I want to use to create the bootable installer is not capable of running Mojave (see my previous question), and when I go to download the installer from the App store, Apple stops me with a message saying:


  We could not complete your purchase.
  
  This version of macOS 10.14.3 cannot be installed on this computer.


Is there any way to get around this limitation?  I am not attempting to install Mojave, just download it to a working system.

Edit 

Note that I the suggested dupe is not a dupe of my problem.  The nominal answer suggests using the direct links on the App store to download the installers.  But as I mentioned above, that is what I have already tried to do (and have failed with the above noted message).

I am also trying to do the opposite of that question.  I am trying to download a newer version of macOS onto to a older computer.




And I've gone through all the standard checks and can't see anything that would cause the situation.  But there seems to be lots of people suffering unexplainable slowdowns.  This fresh install and new SSD is meant as a hail Mary.  And at $70 for a 500GB Mushkin SSD it is a no-brainer anyway.
Tetsujin is correct in that using your recovery partition to do a clean install on your Mojave-supported Mac Mini is ideal.  You can then download Mojave from the App Store as usual.

If that is not a viable solution for you:

After reading through the extent of the information given to you in your previous question, would recommend you use dosdude1's Mojave Beta installer tool.  Create your USB installer, install on the Mac Mini's new SSD, and then immediately upgrade to the full version of Mojave

Alternatively, if you're feeling brave, you can follow the instructions here to obtain a copy of the Mojave or High Sierra installers via the download links.

It will take a little bit of work, but you can get it done!