Here is the link on that ad. The ad has the following disclaimer:
This site distributes software free of charge via WeDownload Manager which is compatible with Mac running OS X 10.6+. Besides managing the download of your selected software, the download manager will make recommendations for commercial offers that you might be interested in. The additional software may include toolbars, browser add-ons and other types of software applications. You are not required to install any additional software to receive the software you are trying to download. You can completely remove any of the installed programs at any time in Mac Applications folder. More info about the uninstalling can be found here.
In other words, along with your Flash, you get a crapware manager installed on your machine. This commercial appeared as the "Sponsored" message in the recent Flash news item on the Mac Blog.
Does MR allow WeDownload "Sponsored" commercials?