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I've been waiting with installing the iOS 5.0 SDK, because I worry I might not be able to switch to the 4.3 SDK again. Can anyone tell me if it's possible / safe to upgrade to the 5.0 SDK beta and still be able to use the 4.3 SDK for development?

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You can install 2 or more xcode versions on the same machine. I would suggest doing this so that you can still submit from a non-beta version to the app store if required.

I've done it lots of times without any problems.

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Thanks, I'll install it in /SDK 5.0 so I can use both SDKs :)
Unfortunately they have shared resources that clashed when I tried. Took me a while to clean it up. In the past I've always had a clean OS install on an external disk, and used all beta products there. Keeps you mentally separated, and always my preference. - - - i don't think this happens to everyone, don't know what caught me, just it was lots of hours to clean
you cannot ever downgrade a device, once you 5 Beta an iPhone/iPad there's no going back

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