Do not download the installer. Instead:
These legacy installers will not work on Windows 10 or 11; use Method 2 instead for modern systems. Why do you need the 64-bit version? net framework 20 offline installer 64bit
Run this in Command Prompt:
Search for in the Start menu.
This download is primarily intended for Windows Vista, Windows Server 2008, or systems where Windows Update is disabled . Do not download the installer