Update APK Installed App I recently installed an app to my phone using an APK, because this app is not available in my country. When I looked it up in my Google Play Store (I only get to view this app in my wishlist, because it doesn't show up when I just search for it), there is a mark on my wishlist that this app is now installed on my phone, but when I view the app, there is still the notice message of "This item isn't available in your country."

Will I be able to receive the update? If not, is there a way to update this app?
No. The only way to update the app is download the new version apk and install it. 

I had similar experience with a game they released only for certain parts of the world. Then they released an update that I had to install in order to play the game, but since it wasn't available in my country I had to look for the updated apk and install it outside Google Play Store.