QT只有30使用期限吗？
Your evaluation allows you to try Qt for the next 30 days, ending on 2012-12-11. The evaluation version contains all the functionality of Qt, but is limited to 30 days.
Please note that the usage is restricted to the evaluation only. See the User Licensing Agreement included in each package for details.
30天到了之后是不是就限制了？有没有序列号和破解版之类的？
[解决办法]
楼主看的估计是商业版的，免费版的在这http://qt-project.org/downloads
