That&#x27;s a good point, but 10.6 support was dropped in 1.7.0 so technically the 1.5s should be able to run 1.6.1.<p>Also I undercounted the number of old versions, turns out <i>ancient</i> sparkles didn&#x27;t have a CFBundleShortVersionString in their plist and I also have a bunch of Sparkle 1.0 and 1.1 lying around.