The introductory videos don’t seem to have captions. Can anyone point to Scrivener tutorial videos for Windows that do?
I assume you mean the videos here?
As mentioned at the top of that page: “Note that subtitles can be auto-generated when viewing via YouTube.”
If you click on the YouTube link located immediately prior to that sentence at the linked page (part of the “Also available on YouTube” sentence), you’ll be taken to the Scrivenerapp channel on YouTube.