Take a look at the mega thread, I've followed it to "awesomePiracy" and found this list: https://shakil-shahadat.github.io/awesome-piracy/#courses-and-tutorials
If it's something popular you may find your course in public torrent sites.
My tip: if you didn't find it anywhere, sometimes VPN to India will drop the price in 50-90% of the "original" price.
Sometimes you can literally just go to the
youtubeinvidious channel of a professor at a big name college, if it's the kind of topic where a lecture series alone can provide the education you're looking for.If you are still seeing this OP. you can go to your favorite search engine and type. site:freecoursesite.com "Insert course name here" (without the quotation marks) if it's popular enough you will find torrent links for it and sometimes gdriive too. Just make sure you are using uBlock Origin tho their sites are infested with ads
