你好,
在安装Visual Studio之前,需要检查一下所有的Windows 更新,将所有的补丁都打上。
从你的描述来看,Update for Windows 8.1 (KB2999226) 没有安装,导致了Visual C++转发包安装不了,造成VS安装失败。
首先请下载并且安装以下更新:
https://www.microsoft.com/en-us/download/details.aspx?id=49071
确保你机器上所有的更新都安装完毕,然后你提到VS 2015是从网盘上下载的,这种渠道也不能确定你的VS 安装包是否有损坏,建议您从以下官方网站下载:
https://www.microsoft.com/en-sg/download/details.aspx?id=48146
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