STEP7经常弹出画面，30.11.2010过期，不知道怎么回事。我的授权管理器中STEP7 对应的标准许可证类型为SINGLE,许可证类型为无限制，有效性为无限制。

画面的开始部分为德语，下面为英语，内容如下：
“The lease time for this pre-release version of the software component SIMATIC Divice Drivers has expired on 30.11.2010!
This version was made for integration and system test only.
Please install a newer version of your test software in order to get a newer version of SIMATIC Device Drivers.”