For IT administrators managing multiple machines without access to deployment servers, community-created portable scripts or utilities can automate the process described in Method 1.
Method 2: Download the Official Microsoft Standalone Installer (Requires Temporary Internet)
If you need help identifying your to get the correct ISO, or if you are running into a specific error code during the DISM process, let me know the details so I can guide you through the exact fix! Share public link
Method 1: The Official Native Method (Using Windows 10 Installation Media)
To understand the importance of the offline installer, one must first understand the architectural split within the .NET ecosystem. The .NET Framework 3.5 is distinct from its successors (4.0 and above). It incorporates versions 2.0 and 3.0, serving as the final iteration of the "classic" .NET runtime stack. When a user attempts to launch an application built on these older frameworks on a fresh Windows 10 installation, the system prompts a download. However, this process is not merely a file transfer; it is a feature enablement process that sources files from Microsoft’s servers. For users in enterprise environments, areas with poor internet connectivity, or those facing strict firewall restrictions, the default online method is often a bottleneck that halts productivity. Net Framework 3.5 Offline Installer Windows 10 64 Bit
Navigate to the official Microsoft download page: .NET Framework 3.5 Service Pack 1 (Runtime).
If you need help resolving a specific error code during setup, tell me and the exact error number you encountered. I can provide the precise registry fix or command line adjustments to bypass it. Share public link
Copy and paste the following command into your command prompt, making sure to replace with the drive letter you noted in Step 1:
Microsoft’s official dotnetfx35.exe (offline web installer) is actually a hybrid. It still tries to download payloads from the internet. However, you can trick it by pre-downloading the CAB and using a command-line switch. However, this process is not merely a file
/online : Targets the operating system you are currently running.
Temporarily bypass WSUS by altering the registry key HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU\UseWUServer to 0 , restarting the Windows Update service, running DISM, and switching it back to 1 . Verifying the Installation
Navigate to the official Microsoft .NET Framework download repository.
Enable-WindowsOptionalFeature -Online -FeatureName "NetFx3" -Source "E:\sources\sxs" -LimitAccess Use code with caution. Press and wait for the deployment process to finish. restarting the Windows Update service
The is essentially a .cab (cabinet) file or the sxs folder from a Windows 10 installation ISO. Once you have this local source, you can install .NET 3.5 on dozens of machines without an internet connection.
Look for at the top of the list. Check the box next to it.
Download the .NET Framework 3.5 Service Pack 1 (Bootstrapper/Standalone Installer).
Months ago, a senior dev had mentioned a backup. “Always keep a full standalone copy of .NET 3.5 on a flash drive,” he’d said. “It’s the skeleton key for old Windows apps.”