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When viewing help documentation in Xcode 4.2 (iOS SDK 5) we get these error messages:

"index.html" is locked for editing and you may not be able to save your changes. Do you want to unlock it?
The file "index.html" could not be unlocked. The file is a remote resource. Try making a local copy.

How can we view online help?

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up vote 5 down vote accepted

Very simple but effective solution:

  1. Open Xcode menu > Preferences...
  2. Click Downloads category
  3. Click Documentation tab
  4. Select "iOS 5.0 Library"
  5. Click Check and Install Now

This will download the documentation (about 360 MB) and solve the issue.

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Updating to Xcode 4.2.1 will fix this problem

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