The drivers should automatically be on your computer and be able to work. So try and just plug in the camera and check by video calling someone or taking a video from standard windows software. If there is special software needed you can find it on the Logitech website.
Yes - When you go to Logitec website download the software for the this webcam. When you click on the new Webcam software it has a Help at the top right - click on it and you can view or print the Manual.
Hello. The C615 does not have a light source. It works pretty well in low-light conditions, but an external lighting source is always highly recommended for better quality videos.