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You typically don't need a separate download for version 3.5; it is built into Windows but disabled by default. Download .NET Framework - free official downloads

It is highly recommended to use to ensure the security and integrity of your system. Download Type .NET 3.5 (includes 2.0 & 3.0) Web / Offline Download .NET 3.5 SP1 .NET 4.0 (End of Life) Download .NET 4.0 (Unsupported) .NET 4.5 Download .NET 4.5 How to Install .NET Framework Versions 1. Installing .NET 3.5 on Windows 10/11 download-net-framework-all-edition-3-5-4-0-4-5-gratis

Microsoft’s is the backbone for thousands of Windows applications. While modern development has shifted toward .NET 8+ , many legacy programs still require specific versions like 3.5, 4.0, or 4.5 to run. You typically don't need a separate download for version 3