I saw the program throwing an exception if a Windows Build for a particular revision was missing. It downloads a 0 byte file, then throws an exception trying to extract it.
Also a suggestion: Update the values in the combo boxes as the tool runs, so if the program fails for some reason, you don't lose progress in your bug search.
Also a suggestion: Update the values in the combo boxes as the tool runs, so if the program fails for some reason, you don't lose progress in your bug search.