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You don't really need the lectures - I took the main version (cs140) with ousterhout. His notes are condensed and give you a good summary of the basics. They're also open to the public:

https://web.stanford.edu/~ouster/cgi-bin/cs140-spring14/lect...

https://www.ops-class.org

Berkeley's CS 162 is great, and recordings are available on internet archive. There are some decent undergraduate textbooks these days too: OSTEP is particularly accessible and free online, and the Tom Anderson _Operating Systems: Principles and Practice_ book is solid.