revtex4-1.cls not found in miktex2.9 in Windows 7

I have installed Miktex latest version today in a newly formatted Windows 7. Then tried to run a .tex file in Texstudio. That file starts with:

documentclass[12pt,preprint,superscriptaddress,floatfix,showpacs]{revtex4-1}
usepackage[utf8]{inputenc}  %Input what you want e.g., é, ł, a, ü
usepackage[T1]{fontenc}     %Output what you want e.g., é, ł, a, ü
usepackage[british]{babel}  %Do hyphenation according to british english
usepackage[sc,osf]{mathpazo}linespread{1.05}  %Palatino font
usepackage[scaled=0.86]{berasans}  % URL font that go well wtih palatino
%usepackage[scaled=1.03]{inconsolata} %Monospace font
usepackage[colorlinks=true, citecolor=blue, urlcolor=blue]{hyperref}  %Hyperlinks (pink, green, blue)
usepackage{graphicx} % Package to insert exteral figures
usepackage[babel]{microtype}  %Improves text justification
usepackage{amsmath,amssymb,amsthm,bm,amsfonts,mathrsfs,bbm} %Useful math packages
usepackage{xspace}  %Useful to add space in macros
usepackage{pgfplots}
usepackage{color}

And then usual body follows. For your information, this file runs in other computers. But, in the above said pc it shows that revtex4-1.cls is not found.

I then tried to install revtex from Miktex console. It does not show any option.

I even started installing those packages shown in the image and then execute my .tex file. But again revtex4-1.cls is not found.

I searched here also, but have not found any such solution.

Kindly help.

Note: I am not used to with the cmd and other commands / shortforms, so kindly write in an explanatory mode please. Thanks in advance.

Solution / Partial Solution I just changed revtex4-1 to revtex4-2 in the documentclass command. And it runs. For details see the comments below, where daleif and UlrikeFischer solved it. Thanks to them.

documentclass[...]{revtex4-1}

documentclass[...]{revtex4-2}