Hi DFKAS,
据我了解,win 7系统是自带.NET 4.0,你有检测到4.0的版本在你的win 7系统上面吗?
我不太清楚4.0的版本是不是和4.5版本,不能同时共存。你可以尝试把4.0的版本给卸载掉,在安装4.5的版本。
这个4.5版本的官网链接
Best Regards,
Hart
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