So I downloaded nexus to add some mods to the game but the game crashes after the Bethesda logo on launch. I checked nexus and it says for some of the mods that the files 'dawnguard.esm' and 'dragonborn.esm' are missing which what I assume is causing the game to crash. Could any tell me how to get these files or what I have to do to get the game running with these mods please? Explain simply cos I'm new to modding and dont know a lot of these terms. Thanks