Open and note the drive letter assigned to the mounted ISO or USB drive (for example, Drive D: , E: , or F: ). Step 2: Verify the Source Files Exist Open the mounted Windows drive. Navigate to the sources folder.
In this guide, we will explain exactly what .NET Framework 3.5 is, why you need it, and—most importantly—how to download the official offline installer for both Windows 10 and Windows 11.
Right-click the downloaded file ( dotnetfx35.exe ) and select . If prompted by User Account Control (UAC), click Yes .
Установка .NET Framework 3.5 в Windows 10 - Microsoft Learn
If your computer is online but the regular installer fails, use this built-in tool. It uses files already on your hard drive. Press the to open the Run box. Type optionalfeatures and press Enter . Look at the top of the list that pops up. Open and note the drive letter assigned to
Refusing to waste time, Raj chose a safer route: an official offline installer from a trusted source. He downloaded the standalone package to a USB stick from his desktop, brought it to the laptop, and ran the installer as Administrator. The setup unpacked quietly, applied the files, and finished without needing an internet connection. After a quick restart, the legacy app launched perfectly.
Inside this drive, navigate to: D:\sources\sxs\ (where D: is your mounted drive letter). You will see a file named microsoft-windows-netfx3-ondemand-package.cab . This file is the offline installer.
Replace the letter D: in Source:D: with the actual drive letter of your mounted Windows installation media.
Enter the following command, replacing D: with your actual drive letter: Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess In this guide, we will explain exactly what
Note: The downloaded file ( dotnetfx35.exe ) is approximately 231 MB and contains all the payload architecture files required for both 32-bit (x86) and 64-bit (x64) systems. Step 2: Install via Command Prompt
/Source : Points to the specific folder on your installation media containing the necessary files.
Look at the field. If it says Installed , .NET Framework 3.5 is successfully activated and ready to run your legacy software.
This comprehensive guide details exactly how to deploy the on Windows 10 and Windows 11 using official Microsoft binaries and built-in deployment tools. Why Do You Need an Offline Installer? Установка
The .NET Framework 3.5 is a software framework developed by Microsoft that provides a large library of pre-built functionality, security features, and compatibility with various programming languages. This framework is required by many applications, especially older ones, to run smoothly. Some common examples of applications that require .NET Framework 3.5 include:
While I cannot link to third-party hosts directly (always verify checksums), trusted open-source repositories on GitHub maintain a tool simply called
Right-click on the Start button and select or "Command Prompt (Admin)" .
: Insert your USB or right-click your Windows ISO and select Mount . Note the drive letter (e.g., D: ).
This is an important change to note: This change started with Windows 11 Insider Preview Build 27965 and will apply to future major releases, like Windows 11 version 26H1.