Can't reinstall apps on new iPhone 5
I just bought an iPhone 5 and have restored a backup from my old iPhone 3GS, following the instructions on Apple's website. Everything has worked great except some of the apps on the original iPhone. When I tried moving them to the new Phone I got messages saying they couldn't be installed since the app couldn't be located. I managed to re-download all the apps from the new iPhone instead, except for three of them, which are no longer available on the App Store.
So now I wonder, are these lost or is it still possible to transfer them from the old iPhone? Because they still work on that one. When I click on the app icon in iTunes it says the app can't be found because the original file couldn't be located. I'd really appreciate your help! I'm not an expert on computers so please be patient with me haha! 😉