Cubase 5

I have cubase 4 and the update cubase 5 on my old mac laptop and i want to install on my new one. i tried to install frpm the dvd cubase 4 and its working ok. when i start to install cubase 5 wont let me and a massage says that i need at least OSX 10.5 and i have OSX 10.12
Is anyone know why and how i can to it to work???

Because your Cubase version is not compatible with your OS version