Comes with a CD-ROM or if you don't have a CD drive, just download the Mac/PC driver from the Startech Web page. Plug it in, feed in a video signal and press record.
Video Downloadhelper - it's an extension for Chrome or Firefox. Works everywhere (almost) and it's totally free (unless you go for the non-necessary Pro version)
Good point. We all comprehend things from our own viewpoint.
I understood the question to mean the poster wanted to record by frame grabbing a video stream from a video camera on a telescope. This being Ice in space and all.
Guess we wait for the OP to clarify what’s required