Default No Threema for CM10?

Good Morning,

i flashed my Samsung Galaxy Ace with CM10 because i want use Threema.
But now i still cant download it from the play store. It says that my Phone isnt compatible.

Looks like that it isnt enough to use a newer Android version.
So isnt it possible for me to install Threema on a legal way?

I dont want use a illegal downloaded apk.