I'm trying to add this mod to my game,the screenshots are killer but its a 3 part download and the first file wont open in nmm or extract in 7zip manager. i checked the file properties and it said it was blocked for my protection and i changed that to no avail. the other 2 parts open and extract fine but the first one will not no matter what i try. Any help is greatly appreciated as I cant figure it out.I've downloaded it and re downloaded 4 times now.nmm reports an error loading it saying it cannot be opened and 7zip as archive

Using 7-Zip, you have to select all the parts of a multi-part archive in order for it to extract properly.

tried that to,highlited all 3 and extracted to a folder and it all went smooth until the 1st file tried then it gave me an error