The remains a critical runtime environment for running older, legacy desktop applications on modern operating systems like Windows 10 64-bit. While Windows 10 comes pre-packaged with newer versions like .NET Framework 4.8, many older software programs, utilities, and games explicitly require version 3.5 (which includes .NET 2.0 and 3.0) to function.
Restart your computer and try the installation again. Remember to change it back to after installation if you are on a corporate network. The remains a critical runtime environment for running
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Once the process finishes, you can double-check that .NET Framework 3.5 is active on your 64-bit system: Remember to change it back to after installation
If you are setting this up for a specific software application, let me know: What (if any) are you currently seeing? What is the name of the app or game you are trying to run? and try again.
Run DISM /Online /Cleanup-Image /RevertPendingActions in Command Prompt, restart, and try again.