Is the file size less than 5 MB? Did you get the file directly, or have you used an exe? If the answer to any of the questions is yes, you downloaded an ad. Please try downloading the files again and make sure you get the correct ones.
Everything is tested and scanned before being uploaded, this website is virus free. If you get a trojan, it's false positive, like explained http://igg-games.com/virus-trojan.html.
Did you get the file directly, or have you used an exe?
If the answer to any of the questions is yes, you downloaded an ad.
Please try downloading the files again and make sure you get the correct ones.