Websites promising free downloads of the entire series often serve as fronts for cybercriminal activity. According to industry reports: Watch Harry Potter and the Sorcerer's Stone | Netflix
Many "free movie" sites serve as fronts for malware. A common threat is "Peaklight" malware, which is often hidden in ZIP folders disguised as movie downloads and can steal your banking information or social security number. Harry Potter All Movies Download For Free High Quality
If you're still interested in downloading Harry Potter movies, consider the following: Websites promising free downloads of the entire series