Implement software update
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Some spark may come to you from http://winsparkle.org/. It also available GitHub. I'm not aware anything developed for Qt.
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Hi,
There's also KDAB's KD Tools which contains an updater framework
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You may also consider "UpdateNode":http://www.updatenode.com/ or "Flexera":http://www.flexerasoftware.com/products/entitlement-management/flexnet-connect/.