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:"
Dropbox is damaged
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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