Why cant you play a private server with patch 3.2.2

You cannot play it with 3.2.2 as it is not compatiable with the private server. When it says 3.2x then you can play with anything that is 3.2.0 to 3.2.whatever. You will have to downgrade so to speak back down to 3.2.0 which i am not sure how to do as i am still researching it.