The safest offline installer is already hidden inside your Windows 10 installation media (ISO file, bootable USB, or DVD). Windows keeps the required deployment files in a folder named sources\sxs . Step 1: Mount the Windows 10 ISO Locate your file. Right-click the ISO file and select Mount .
Copy the sxs folder from the Windows ISO to a local drive (e.g., C:\dotnet35\sxs ) and use:
If you do not have the original Windows 10 installation media, you can download the standalone executable installer from a device that has internet access, transfer it via a USB drive, and run it on your offline 64-bit machine.
: Open the Registry Editor ( regedit ) and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU . Look for a value named UseWUServer and temporarily change its data value from 1 to 0 . Restart the Windows Update service, run the DISM offline installation command again, and then revert the value back to 1 . Verifying the Installation
Navigate to the official Microsoft .NET Framework 3.5 Service Pack 1 download page using an internet-connected device. Net Framework 3.5 Offline Installer Windows 10 64 Bit
/Source : Points to the specific folder containing the necessary files.
A common myth: "Installing .NET Framework 3.5 weakens Windows 10 security."
/enable-feature /featurename:NetFX3 : Tells Windows to turn on the .NET Framework 3.5 feature.
If you don’t have installation media, download the from a trusted source (e.g., official Microsoft Volume Licensing Service Center or extracted from an ISO). The safest offline installer is already hidden inside
If your offline installation fails, it is usually due to one of three issues: 1. Wrong Drive Letter
I can give you customized commands or registry fixes tailored to your environment. Share public link
Transfer the downloaded executable file ( dotnetfx35.exe ) to your target 64-bit computer. Right-click the file and select . Follow the on-screen prompts to complete the deployment.
No. The recovery drive does not contain the sxs folder. You must use a full Windows 10 64-bit installation media. Right-click the ISO file and select Mount
Type optionalfeatures and press to open the Windows Features window.
In this 2,500+ word guide, we will cover everything you need to know: why you need it, how to get the legitimate offline source, three proven installation methods, troubleshooting common errors, and how to verify a successful install.
Extract the downloaded installer files to a folder on the Windows 10 64-bit system.
Check the box next to . Click OK .
The /limitaccess flag prevents Windows Update from being used. The /source points directly to the sxs folder on the Windows 10 ISO, which contains the exact 64-bit .cab files for .NET 3.5.
To install offline on Windows 10 64-bit, you must use a Windows installation medium (ISO or USB) rather than a standard standalone installer, as modern Windows versions store these files in a specific "Side-by-Side" (SxS) folder. 💿 Prerequisites A Windows 10 ISO or installation USB .