Intel has discontinued and removed the Windows 7 USB 3.0 Creator Utility from its official Intel Download Center due to security vulnerabilities (specifically CVE-2019-0129) and the end of support for Windows 7.
Manufacturer Tools: Other motherboard manufacturers provided similar utilities that may still be available, such as the MSI Smart Tool or the Gigabyte Windows USB Installation Tool. windows 7 usb 30 creator utility intel download center top
files to include the Intel USB 3.0 eXtensible Host Controller drivers Requirement: The tool itself had to be run on a system with Windows 8.1 or later Timeframe: The injection process typically took about 15 minutes to complete 🔄 Recommended Alternatives Intel has discontinued and removed the Windows 7 USB 3
Regarding the "Intel Download Center" aspect of the search query: After injection, if keyboard/mouse still do not work:
By modifying these Windows Imaging Format (WIM) files, the utility ensured that the Windows 7 installer could load the correct USB drivers before the graphical interface started. This allowed keyboard, mouse, and mass storage devices to function normally throughout the entire installation process.
Intel's Windows 7 USB 3.0 Creator Utility - Level1Techs Forums