Wanted S021 of Nat Geographics Air crash investigation series

Hi folks I PAY for Amazon Prime, Netflix etc so I don't feel guilty in asking for this.
As a Private Pilot I'm always interested in anything to do with commercial flying -- and I love the Nat Geographic series of Air Crash Investigations.

I Want to save a load of these series - -- seems that getting the full S021 season is impossible. S01-S19 no problems and S020 episodes OK also. S022 I've already saved.

Any links to S021 -- I don't feel guilty about using "Dubious places" as I've paid for all content anyway so not depriving people of "Intellectual rights" -- This is for my own use anyway. I don't really think this is a huge series that would deprive the makers of a lot of revenue in any case unlike Block Buster TV / Movies.



Cheers
jimbo