Where SBO refers to Safari Books Online (copyrights reserved)
This extension can be used for both new safari site and old site (techbus) to download the videos (but only if you have a registered account at Safari books online)
Now you can choose the download quality (usually start from audio to medium and hight quality video)
The new webiste that have the domain name: www.safaribooksonline.com
Then now you can enjoy the video downloads by clicking the little black icon beside each video lesson allow you to choose the quality to download (see the picture).
The old website the one that have the domain name: techbus.safaribooksonline.com.
Once you have the extension installed, and you click on any video course, after a while (5 seconds) you will see a little orange icon beside each video lesson allow you to choose the quality to download (see the picture).
Feel free to contact me via [opening an issue] (https://github.com/mhewedy/SBO-video-extension/issues/new), email or any mean if you need any help.
You need to provide a course URL and chrome console output along with your issue to be able to help