I just download xcode_3.2.3_and_ios_sdk_4.0.1 two days ago, I found that ios sdk 4.0.2 is available today. My problem is that if I have to download xcode_3.2.3_and_ios_sdk_4.0.2.dmg file again? It's about 2.5gb big. Is there any way that I can just upgrade the ios sdk to 4.0.2 since xcode version is not changed. Another problem is that should I uninstall the previous version before I install the new version, or the installation will do everything for me?(such as cleaning up the useless files of the previous version) btw, can anyone tell me what font the developers use in this video? (http://developer.apple.com/videos/iphone/profiles/#video-demiforce, at 1:13) Thank you very much.