In Windows you have different security setting options. When the security settings are placed at medium or high, Windows will notify you and ask if you want to download specific files that may contain viruses, PDFs may contain viruses or could harm your computer if they were corrupt, etc. Thus Windows delivers a popover saying as much. That doesn't mean our files contain viruses. They don’t. If you attempt to download PDFs from a wide variety of other sites, you will receive the same message.
You can safely download the program and not fear that they are contaminated in any manner. If you have any further questions, please feel free to contact us. We can be reached 24/7 at (800) 316-8556 or firstname.lastname@example.org.