Help? "Incompatible with your device" & "cannot be installed in your device's country"

My cellphone is Samsung Galaxy Mini S5570 with Gingerbread 2.3 as the operating system. So recently, I've just downloaded two ".apk" files because market won't allow me to download the application.

It's "Cotto - Fashion up your Photo" which is not compatible with my device.
and
"DECOPIC,KawaiiPhotoEditingApp" which is cannot be installed in my device's country.

I tried to install the ".apk" file but It won't install. It always end up as "application not installed"

The other ".apk" files which I have downloaded before with the same problem works just fine when I tried to install them. But not these 2 files.

I wonder if there's any solution to this problem?

Thank you very much