Chessus69

So I just added to the nexus after only using the Steam Workshop for years, I would like to download mods that aren't present in the Steam Workshop. I downloaded many mods but when I tried to download the Skyrim HD Collection by Nebula, the nexus mod manager says it can't be added. I really wanted the mod and went to open it without the NMM and WinRar Archiver said the file is corrupt... I really want this mod and i can't seem to attach the file to this post but still, what do I do?