I tried downloading the top Realvision link on this page(no automatic download), but I do not know what I am doing.

http://skyrim.nexusmods.com/mods/30936/?tab=2&navtag=%2Fajax%2Fmodfiles%2F%3Fid%3D30936&pUp=1

The download went fine but when I clicked on the file I got that "Windows cannot open this file" message. There is a Youtube link on the site that expplains how to install but the description says it's outdated.

Can someone please explain to me in 1st Grade language how to properly download this, open it , extract it and get it into the correct file in Steam?

And help would be most greatly appreciated.