Why did I get an error message saying Dropbox is damaged?

When installing Dropbox on OS X 10.11 (El Capitan), you may see an error stating that "Dropbox is damaged and can't be opened:"

If you encounter this error message, we recommend that you restart your computer and run the Dropbox installer again. If you continue to receive this error, try downloading a new copy of the Dropbox installer.

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