Download the file, extract it using 7-Zip, and enter the password when requested. After extraction, you will have a folder containing a Game.exe file that you can use to launch the game.
Search "7zip download" on google and open the first link. If you use windows you should be safe downloading from the first link which should call like "64-bit windows x64". Install it then just right click on the archive, down at the bottom "more option" and find the option of "7zip", then "extract". Put the password when asked.