回帖：我先下载安装了qt-win-opensource-4.7.3-mingw.exe
然后安装了qt-creator-win-opensource-2.3.0-rc.exe
运行creator的时候提示NOvalid QT versions found
please add a QT versions in tool/options via the maintenance tool of the SDK
该怎么解决
同时问下qt-win-opensource-4.7.3-mingw.exe这个安装包到底干啥用的