The safest way to get the standalone installer is directly from Microsoft.
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Installing .NET Framework 3.5 on modern systems like Windows 10 and Windows 11 is a common requirement for running older software and legacy applications. While Windows usually prompts for an internet-based download, you can use an or local installation media to complete the process without an active connection. Direct Download Links (Official) The safest way to get the standalone installer
If you have a Windows 10 or 11 ISO or USB installation drive, you can install the framework using the (Deployment Image Servicing and Management) tool. This method is the most reliable for offline environments. – This is the complete 231 MB redistributable
– This is the complete 231 MB redistributable package that does not require an internet connection during installation. The safest way to get the standalone installer
: Insert your USB or right-click your Windows ISO and select Mount . Note the drive letter (e.g., D: ).