I hesitate to write this post simply because when you download videos from Youtube and did not get the authors permission and then you use those videos elsewhere it is not the most ethical method of display. The best method is to simply stream the video. That being said, though, there are some districts whose ability to stream videos from Youtube during the school day either due to policy or bandwidth may not have any other choice. So below is an extension you can install that will allow you to download youtube video if you are using Google Chrome.
1. For some reason this extension does not install using the normal method that I have demonstrated before. So this "Hack" is a little different but can be done in just a few steps.
2. Go to the following website.
3. This will trigger an automatic download, hopefully at the bottom of your Google Chrome browser. Also while you are on that link you will be able to view a video on how to install this extension correctly.
4. Now click on your "Settings button" in the top right corner of Google Chrome. It used to look like a Gear but now it is a 3 bar icon. Once you click on it choose the "Tools" option and the select the "Extensions" option.
5. Now left click and hold on the downloaded file and then drag it up into the extensions list. Just let go of you mouse to drop it in the middle somewhere.
6. This will then install the extension. Now go to Youtube to test it out. If all installed correctly you should now see a "Download" button below the videos.
7. When you click on the "Download" button it will give you a list of file times that you can save the video as. You might want to play with each file type to see which one works the best for you, because you also need correct software in order to play the video. I usually choose one of the "FLV" media types because I use VLC player and it will play that type of video.