Is this what you're looking for?
https://v1.tailwindcss.com/course/setting-up-tailwind-and-po...
There's a version selector in the upper right corner.
Oh, thanks! I didn't realise they still had the old site up somewhere.
Where were you watching them? Assuming you mean these, hosted on egghead:
seem to be all there :-
https://www.youtube.com/playlist?list=PL7CcGwsqRpSM3w9BT_21t...
They're all gone. Vanished completely from the website. And I was half-way through!!! Now they link to somebody's youtube channel for random Tailwind stuff rather than the nice walkthrough/tutorial that were the originals.