The Windows 7 SP1 Official ISO images hosted on Digital River are genuine and official version, and the downloads from the server is totally free and definitely legal. It’s after all one of the official channel where end-users who purchase a license (product key) for Windows 7 get the setup installation files.
Anyway, without a genuine and legally purchased product key, you can’t get Windows 7 activated, and Windows 7 will only run as evaluation copy for up to 30 days.
Links to download Windows 7 SP1 Official ISO from Digital River:
Windows 7 Ultimate SP1-U ISO
English x86: X17-59463.iso
English x64: X17-59465.iso
French x86: X17-59477.iso
French x64: X17-59479.iso
Spanish x86: X17-58877.iso
Spanish x64: X17-58879.iso
Windows 7 Professional SP1-U ISO
English x86: X17-59183.iso
English x64: X17-59186.iso
German x86: X17-59886.iso
German x64: X17-59885.iso
French x86: X17-59195.iso
French x64: X17-59197.iso
Spanish x86: X17-58866.iso
Spanish x64: X17-58868.iso
Italian x86: X17-59212.iso
Italian x64: X17-59215.iso
Portuguese x86: X17-59246.iso
Portuguese x64: X17-59247.iso
Swedish x86: X17-59271.iso
Swedish x64: X17-59273.iso
Norwegian x86: X17-59229.iso
Norwegian x64: X17-59231.iso
Finnish x86: X17-59192.iso
Finnish x64: X17-59194.iso
Dutch x86: X17-59233.iso
Dutch x64: X17-59236.iso
Danish x86: X17-59891.iso
Danish x64: X17-59883.iso
Traditional Chinese x86: X17-59295.iso
Traditional Chinese x64: X17-59297.iso
Korea x86: X17-59299.iso
Korea x64: X17-59300.iso
Windows 7 Professional N SP1-U ISO (Note: N editions come without media components)
English x86: X17-59335.iso
English x64: X17-59337.iso
German x86: X17-59323.iso
German x64: X17-59327.iso
French x86: X17-59348.iso
French x64: X17-59351.iso
Spanish x86: X17-58871.iso
Spanish x64: X17-58874.iso
Italian x86: X17-59364.iso
Italian x64: X17-59366.iso
Portuguese x86: X17-59395.iso
Portuguese x64: X17-59398.iso
Swedish x86: X17-59418.iso
Swedish x64: X17-59424.iso
Norwegian x86: X17-59380.iso
Norwegian x64: X17-59383.iso
Finnish x86: X17-59344.iso
Finnish x64: X17-59346.iso
Dutch x86: X17-59384.iso
Dutch x64: X17-59387.iso
Danish x86: X17-59318.iso
Danish x64: X17-59320.iso
Windows 7 Home Premium SP1-U ISO
English x86: X17-58996.iso
English x64: X17-58997.iso
Spanish x86: X17-58857.iso
Spanish x64: X17-58859.iso
French x86: X17-59007.iso
French x64: X17-59009.iso
