iOS Xcode and iOS sdk update problem

[icoigo]

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.

 

[Luke Redpath]

Nope, you need to download the whole package again.

 

[LyNuocLanh]

My problem is I tried twice and was unable to download the 2.5 gig of xcode_3.2.3_and_ios_sdk_4.0.2, twice it stopped around 1.6 GB and, of course, I had to restart over again. Maybe I should upgrade to a faster DSL service, but doing so just to download this SDK is not worth it.

Any ideas or suggestions from anyone?

Thanks in advance!