is it possible to do manule install and my FSX is persion edition(no nothing in it except the lessons are in persion) and it is in NPgame not msgame
I don't understand you.
As I've said, the installer checks the Windows registry keys for FSX for the actual installed location, and then check the FSX.EXE executable in that location for its version, I don't think the demo install in the same folder as FSX and uses the same registry keys, that would be the only possible reason for the installer being confused, but you might try uninstalling the demo.
If you still see that message, it means your FSX registry keys are wrong, missing or pointing in the wrong folder. In this case, you should use some free FSX registry fix tools (there's one available from Flight1) to repair it.