SteamRIP's site is a bit of a pain, so be sure to use an Adblocker (outlined on the Start Page).
When on the site, try to use the "BZZHR", "Gofile" or "Vikingfile" links if they're available. They're generally the fastest to download and the most reliable.
The games come pre-installed, just unzip and double click the game's executable (.exe).