Microsoft stores the exact deployment payload for .NET 3.5 inside a specific directory on these disks. You do not need to download sketchy executable files from third-party websites. Step 1: Mount Your Windows ISO File
右键开始菜单，选择“Windows终端”或“PowerShell”，输入以下命令：
. Because of this, standard "offline installers" downloaded from the web often fail because they expect the core components to already be active.
Locate your . If you do not have one, you can download it for free directly from Microsoft's official website using their Media Creation Tool. Right-click the ISO file and select Mount . Microsoft stores the exact deployment payload for
如果你的电脑虽不能联网，但插入了Windows安装光盘，或者系统保留了本地源，可以尝试此方法。
These errors indicate that Windows cannot find the source files to read from.
If you have an internet connection, you can simply toggle it on without downloading a separate installer. Microsoft Learn Open the Start menu and search for "Turn Windows features on or off" .NET Framework 3.5 (includes .NET 2.0 and 3.0) in the list. Check the box, click Right-click the ISO file and select Mount
If your internet connection is stable and you want to try the built-in Windows interface before sourcing offline files, follow these quick steps:
Sometimes, things don't go as planned. Here are solutions to the most frequent issues you might encounter.
Q: Can I uninstall the .NET Framework 3.5 if I no longer need it? A: Yes, you can uninstall the .NET Framework 3.5 if you no longer need it. However, be aware that some applications may rely on this version to function properly. follow these quick steps: Sometimes
: Open the mounted drive and navigate to the sources\sxs folder. Ensure the file named microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab is present.
The .NET Framework 3.5 includes cumulative update files from versions 2.0 and 3.0. Using an is preferred when: You have a limited or unstable internet connection.
对于技术不太熟练的用户，可以自己制作一个小脚本。创建一个新的文本文档，粘贴以下代码，另存为 Install_NET35.bat ，右键以管理员身份运行即可。此操作必须在与 .cab 文件同目录下执行。
