Click . If the source files are present on your hard drive, Windows will configure the feature immediately.
If you do not have installation media, you can download the full redistributable package from a computer with internet and then move it to your offline PC.
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。
I can give you the exact command or workaround to clear the error.
: Once the progress bar reaches 100%, the feature is enabled. You may need to restart your computer.
Allows system administrators to install the runtime on multiple PCs quickly using a USB drive.
许多用户可能会疑惑，既然Windows自带了更高版本的.NET 4.x，为什么运行一些老程序时系统仍然要求安装.NET 3.5？答案是：。
Download .NET Framework 3.5 Offline Installer for Windows 10/11: Free & Direct Solutions
In the "Windows Features" window, look for the first item on the list: . Check the box next to it.
Browse and point the application to your Windows installation source folder, or allow the tool to download the standalone cabinet payload automatically.
The safest, fastest, and most reliable "offline installer" is already sitting inside your official Windows 10 or Windows 11 installation media (such as an ISO file, a bootable USB drive, or a recovery DVD).
This is the classic GUI method, but it requires an internet connection. We include it here for completeness.
Open in File Explorer and note the drive letter assigned to the mounted ISO (for example, Drive E: or Drive F: ). Step 2: Verify the Source Directory Double-click your mounted Windows drive. Navigate to the sources folder, then open the sxs folder.
Open in File Explorer and note the exact drive letter assigned to the mounted ISO or USB (for example, Drive D: or Drive E: ).
Ensure you run the Command Prompt strictly as an Administrator. Group Policy Blocking Feature Installation
This error usually implies that advanced security software, a proxy server, or an active VPN is blocking the local deployment process.
Check the box for .
Click . If the source files are present on your hard drive, Windows will configure the feature immediately.
If you do not have installation media, you can download the full redistributable package from a computer with internet and then move it to your offline PC.
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。
I can give you the exact command or workaround to clear the error.
: Once the progress bar reaches 100%, the feature is enabled. You may need to restart your computer. Allows system administrators to install the runtime on
Allows system administrators to install the runtime on multiple PCs quickly using a USB drive.
许多用户可能会疑惑，既然Windows自带了更高版本的.NET 4.x，为什么运行一些老程序时系统仍然要求安装.NET 3.5？答案是：。
Download .NET Framework 3.5 Offline Installer for Windows 10/11: Free & Direct Solutions
In the "Windows Features" window, look for the first item on the list: . Check the box next to it. a proxy server
Browse and point the application to your Windows installation source folder, or allow the tool to download the standalone cabinet payload automatically.
The safest, fastest, and most reliable "offline installer" is already sitting inside your official Windows 10 or Windows 11 installation media (such as an ISO file, a bootable USB drive, or a recovery DVD).
This is the classic GUI method, but it requires an internet connection. We include it here for completeness.
Open in File Explorer and note the drive letter assigned to the mounted ISO (for example, Drive E: or Drive F: ). Step 2: Verify the Source Directory Double-click your mounted Windows drive. Navigate to the sources folder, then open the sxs folder. Navigate to the sources folder
Open in File Explorer and note the exact drive letter assigned to the mounted ISO or USB (for example, Drive D: or Drive E: ).
Ensure you run the Command Prompt strictly as an Administrator. Group Policy Blocking Feature Installation
This error usually implies that advanced security software, a proxy server, or an active VPN is blocking the local deployment process.
Check the box for .