Or better use the FAQ about how to install and launch addons
To use winrar or other program i recommend 7zip (which is free and can be downloaded here
), just right click the downloaded file and select "extract here", now select the files you wanna copy/move and do a "cut" and then "paste" in the folder you want.
You can also do a double click on the downloaded file to open it with winrar or 7zip or any other program u use and then drag the files in side (those you want to copy) to the folder you selected as destination. This is what i do:
1- open the file (double click)
2- on the windows explorer move tot eh folder i want to extract the files
3- move back to the 7zip window and hold and drag the files i want in the windows explorer window which has the desired folder opened.