Answer:
This is not possible since when you access any online data (movie or a website page) it must be downloaded to you computer. When a video is streamed to your computer it still downloads the video's data to your computer even if it is not seen as a single file like a standard file download. To access anything online without downloading it would be like trying to see a photo without using your eyes.
Now that you understand what downloading means, Hulu is a free and legal source for movies online.