Step7安装有什么技巧可询？请指教。
我安装了Step7 软件后，程序启动时出现下列提示框：
标题为：STEP 7 Wizard：“New Project”
内容为：Cannot start the STEP 7 Wizard.
The default directory does not exist.
请教一下是怎么回事？
若直接点击确定，则出现下列提示框：
标题为：Open Project
内容为：The project contains objects of the optional package 'WinCC (Component Object Manager)' that cannot be processed because the optional package is not installed or outdated version is installed.
又是怎么回事？