Microsoft tries to funnel average users toward an "Upgrade Now" executable rather than the ISO file. Extracting the direct ISO link sometimes requires a minor workaround (using a mobile user agent in the browser developer tools) if you want to skip the Media Creation Tool.
The “64-bit” specification is crucial: modern PCs with over 4GB of RAM need the 64-bit version to address all system memory. Microsoft stopped distributing 32-bit Windows 10 to OEMs in 2020, but the 64-bit ISO remains the standard. windows 10 pro iso file download 64-bit