@rcentros, I think you're missing a point about HarryT's answer and your question. HarryT says that Qt5 is installed with calibre 2.X and that's true. But you were asking about installing Qt5 in Windows over an older installation, so adding to it out of calbre environment. Those are two totally different situations.
Indeed, if you get calibre 2.0, you can install Qt5 over Windows XP, but you could find problems (in the same way you could find problems in LInux if you install a new package over an older distro), and as it looked like the problems were common, the installation was restricted inside calibre.
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