QT安装包
http://download.qt.io/official_releases/qt/
包含QT低版本的下载：
http://www.qtcn.org/bbs/read-htm-tid-1075.html
qtcreator
http://download.qt.io/official_releases/qtcreator/
Qt VS开发插件下载地址:
http://download.qt.io/archive/vsaddin/
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