Difference between PUN classic and PUN2

Hey, I've been following a tutorial recently that uses PUN classic and I've heard that unity 2020 is not supported by PUN classic. Because of this, I'm using PUN2 instead, but have encountered issues such as 'the name 'PhotonNetwork' does not exist in current context' from exactly following the tutorial. If you could please tell me why this is happening you have my thanks.

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