Does the distribution of Xcode now available from the OS X App Store replace a previous version downloaded directly from the Apple Developer site; or will “switching” from an Apple Developer installation to an App Store installation cause problems?
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You really shouldn’t have any problems switching from an installed 4.2 to a Mac App Store “installed” 4.3. All your profiles are stored in
~/Library. All your certificates are in your keychain.I’ve switched fully to 4.3 and not had a problem with any configuration. It’s all still working just as it was in 4.2.
That said, if you do have specific problems, then please either open a new question for that specific problem or file a radar if it’s something that Apple need to fix.