A more sophisticated ruse involves downloading a 500MB file that is actually a downloader. Once opened, it connects to a server and begins downloading the actual 40GB game in the background. The "500MB Portable" claim was simply a lure to get you to install their proprietary (and often malicious) download manager.
Forza Horizon 2 Highly Compressed 500MB Portable PC Game: A Realistic Look forza horizon 2 highly compressed 500mb portable
