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At the time that CNET TechTracker was developed, we did use what was called the CNET Installer or Download.com Installer to deliver the file. The Installer did show third party offers and was sometimes flagged by antivirus apps as a PUP or adware, but it has not been in use anywhere on our site for almost two years, and we do not include adware in any of our downloads.
That said, individual product publishers may still include additional, optional third party offers in their own installers (on any site). Although you are never required to accept any offers from a publisher in order to complete installation of their software, you will generally want to keep a close eye out to be sure that you see and have a chance to select the decline or opt-out option for any offers you do not want.