You might want to give "macOS Patcher" a try. http://dosdude1.com/software.html http://dosdude1.com/software.html It's main purpose is to allow for running mac

You might want to give "macOS Patcher" a try. http://dosdude1.com/software.html http://dosdude1.com/software.html It's main purpose is to allow for running macOS on unsupported Macs, but it also can download the original unmodified version. I've only used the unpatched Mojave version myself and I have no idea how well it supports slow/unstable connections.