In Rufus, click "Select" and find your Windows 7 ISO. Partition Scheme:
Choose if you are installing on a newer UEFI-based system.
A popular community-driven option for enthusiasts. You can search for "Windows 7 ISO official untouched" on Archive.org to find archived versions.
Once Windows 7 64-bit is installed, be aware of the following:
Use a community tool like "Legacy Update" to help the Windows Update agent actually find the final patches released up to 2020.
Microsoft has made it slightly more difficult to find the direct download links, but the page is the safest source.