Lion cannot install

[dushkinalex]

I have an installed Mountain Lion with MLPF (I have an unsupported MacBook 4,1). When I try to launch OS X Lion installer, it says that it's an issue and I cannot install it.
It shows this after a few seconds from I boot the install USB.
What's this?

 

[havokalien]

Downgrade?

Are you trying to install it and its unsupported? If so it won't install. There are ways to install software on unsupported machines.