你好,
>D:\sources\sxs里的文件是不是全部都需要?
是的,我们需要复制整个sxs文件。
具体安装步骤有两种;
1. 插入光盘,然后以管理员身份打开CMD, 输入以下命令:
Dism /online /enable-feature /featurename:NetFx3 /LimitAccess /All /Source:D:\sources\sxs
2. 我们也可以将D:\sources\sxs复制到本地的某个文件夹,然后将该文件夹当作安装源。
所以,我们需要复制整个sxs文件。

https://docs.microsoft.com/en-us/troubleshoot/windows-client/application-management/dotnet-framework-35-installation-error
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Best Regards,
Anne
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