You can download one tree hill from this link they have lots of information about this tv show and all the others.
You can try youtube.com
Download it from here
If youtube is not enough for you. http://www.ant.com/download-videos/ is a good place to search videos. It has a directory of streaming sites on the web and they have a free video downloader. Easily download videos from a variety of streaming sites such as YouTube, Google video and save them to your hard drive.
edogo and youtube is good option to download it.
You can download On tree hill episodes free at www.download-tvshows.com
i think YouTube is good option to download it.
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them