Net Framework 3.5 Offline Installer Windows 10 64 Bit May 2026

Microsoft .NET Framework 3.5 is a software framework that provides a runtime and libraries for running applications built with .NET technologies, including many legacy desktop programs and installers. On Windows 10 (64-bit), some applications explicitly require .NET Framework 3.5 (which includes 2.0 and 3.0) even though newer .NET versions are available. When a system lacks this feature or cannot download components from Windows Update, an offline installer provides a standalone method to enable or install .NET Framework 3.5.

You likely downloaded an ARM or 32-bit CAB. Ensure your ISO is labeled x64 (not x86).

Step 1: Mount the Media If using an ISO file, right-click the file and select Mount. Note the drive letter assigned (e.g., Drive E:). If using a USB drive, simply plug it in and note the drive letter. Net Framework 3.5 Offline Installer Windows 10 64 Bit

Step 2: Open Command Prompt as Administrator Press Windows Key + X and select Command Prompt (Admin) or Windows PowerShell (Admin).

Step 3: Execute DISM Command The syntax for the command is strict. Replace E: with the drive letter of your mounted media. Microsoft

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:E:\sources\sxs

Step 4: Command Breakdown

Step 5: Verification Once the process reaches 100% and displays "The operation completed successfully," a system restart is usually recommended, though not strictly required for the runtime to become functional. Verification can be performed by navigating to: Control Panel > Programs and Features > Turn Windows features on or off Here, the box next to ".NET Framework 3.5 (includes .NET 2.0 and 3.0)" should be filled. Step 4: Command Breakdown

  • If DISM still fails, try mounting the ISO and running from that mounted drive, or extract the sources\sxs folder to a local folder (e.g., C:\sxs) and run: 
    DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:C:\sxs
  • If there's a mismatch between ISO and installed Windows build, download the correct ISO matching your Windows 10 build and try again.

    • You cannot simply download a single .exe from a random third-party site without risk (malware is rampant). The safest method uses Microsoft’s own Windows 10 Installation Media (ISO file). Here is the industry-standard, secure method: