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That's rather biased for Calibre, though. There were probably a dozen version upgrades in that time, and the majority of users will have downloaded several of them, since Calibre prompts you by default.
Tools, by contrast had 2 or 3 (?) versions in that time, and upgrading isn't nearly as straightforward, so non-technical people would avoid doing so, unless they needed one of the enhancements.
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