AppStore not letting me download an app? DETAILS?

Hi! I erased my iPad 1st generation iOS 5.1.1 all settings and I now wanna download a free app (btw the app is called: Video Download Browser by Jing Gao). I have downloaded that app before a long time ago before I erased the settings and now I wanna download it and it keeps saying item not available in the US store. I changed the location to Canada and Qatar too, but it still says the same message. I even tried signing in with other apple ids but no use. I have downloaded it even using a US store location apple id but i dont know shy its saying that now.Why? How can I download it again with no problem? Please help a.s.a.p. THANK YOU!

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