Paramount often runs older Nickelodeon shows on their free, ad-supported streaming service, Pluto TV. It might not be on-demand, but you can catch episodes running on their "Nick Classics" or "TeenNick" channels.
However, I can offer a few alternative paths if you’re interested: Drake And Josh Complete Torrent
From the iconic "Soul Man" hugs to the "Dune Buggy" incident, this is comfort TV at its finest. Paramount often runs older Nickelodeon shows on their