: If you find that NGen.exe uses high CPU after installation, this is normal; it is optimizing the framework for your specific hardware. Why 64-bit Matters

: Note that .NET Framework 2.0 SP1 is no longer in support . While it still functions, it may not receive security patches.

Open the and type Turn Windows features on or off . Locate .NET Framework 3.5 (includes .NET 2.0 and 3.0) .

The 64-bit (x64) version allows the framework to address more than 4GB of RAM, which is essential for older server-side applications or database-heavy tools. When using the offline methods mentioned above, Windows will automatically install both the 32-bit and 64-bit components if you are on a 64-bit OS.

The .NET Framework is a proprietary software framework that provides a managed execution environment (the Common Language Runtime, or CLR) and a large library of pre-coded solutions (the Framework Class Library). Version 2.0 was the first to provide significant support for 64-bit (x64) architectures, allowing developers to build more memory-intensive applications.

: Older versions like 2.0 can be vulnerable to remote code execution . Only use it for legacy apps that strictly require it.