If a video asks you to “install” something, it is either:

Never run an .exe or installer file if you are just trying to watch a video.

Below is a guide on why you should avoid these types of "install" links and where you can safely watch the legitimate series. The Risks of "Install" Links

The whole pipeline from disk to browser takes under a second for a 720p source on a typical laptop—an impressive feat for a tool that weighs less than 30 MB.