I have an Nokia Lumia 520 , Windows Phone 8. I really have no idea how to install xap files on it .. From tutorials from youtube , i tried to update my phone to windows 10 , but not workingv , the system is not good for 10 .. and .. please help .. ?
xap files are not hosted anymore as Microsoft has blocked or taken down such websites. Windows phone 8 is obsolete you should either buy a new device with windows 10 mobile or consider switching platform.