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Windows 7或Windows Server 2008 R2安装Wyn失败

为了准备 Wyn 运行所需的.NET Core运行环境，Windows 7/Windows Server 2008 需要安装较多 Windows 补丁。这些补丁已经打包在安装文件包中自动安装。由于 Windows 本身的问题，在某些偶然的情况下，补丁的自动安装可能失败。此时，可按如下步骤，手工安装这些补丁。

1. 下载两个 Windows 补丁包：

Windows6.1-KB2533623-x64.msuWindows6.1-KB2999226-x64.msu

2. 以管理员身份启动 cmd 命令行窗口，解包 msu，如：

expand –F:* D:\update\Windows6.1-KB2999226-x64.msu D:\update\

3. 得到 cab 文件之后，用下面的命令安装补丁：

dism.exe /online /Add-Package /PackagePath:D:\update\Windows6.1-KB2999226-x64.cab

4. 重启电脑，再装 Wyn。