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Go to the 5.5 stable update center and there is Samples|DilbertViewer plugin. Try to add it to the list of modules for install and the Error dialog appears - see attached screenshot. This is probably only the Mac OS X platform dependent problem.
Created attachment 41136 [details] Screenshot attached...
I believe this is not Mac OS specific since it happens to me on Windows XP as well.
I believe this has been fixed in that we've put a new error message in that describes better what the missing pack is. Please reopen if it's not the case.
Yes, now the message appears before the dependency error pop-up. VERIFIED.