How to upgrade from old Cocos2d projects?

I believe quite a few readers might have similar question like me - how to upgrade an old application with outdated Cocos2d to the latest version?

I was reading chapter 7 (scrolling with joy) of Cocos2d book. And the author uses "SneakyInput" as example to port it to a new Cocos2d project. All he did is create a new Cocos2d project, then copied a few classes over from the old one, and that's it? Since every project is different, it could be a lot more complicate for other projects... Will give that a try later...

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