Official Windows 7 SP1 ISO from Digital River

With the release of Windows 7 SP1, Microsoft has also updated the Windows 7 DVD media ISO image distributed by Digital River for online order fulfillment. Digital River is Microsoft’s partner for fulfillment on online distribution for downloadable Microsoft products.

The Windows 7 ISO images hosted on Digital River is genuine and official version, and the downloads from the server is 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.
The latest version of Windows 7 DVD image available is of media refresh version, which commonly known as Windows 7 SP1-U (Media Refresh). Microsoft released the media refresh version of Windows 7 DVD media to fix a rare bug related to invalid computer name when small set of computer names returned error when used to install Windows 7. Otherwise, the Windows 7 with SP1 and Windows 7 with SP1-U (Media Refresh) is completely the same.
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
While the official Windows 7 SP1 DVD media ISO images are only available in limited sets of languages and editions, it’s possible to install a language pack to switch to another display language, and use Windows 7 ISO Image Edition Switcher to change to another edition. The ultimate solution is to create an all-edition Windows 7 ISO image with ei.cfg Removal Utility.
via MDL Forums

Download Windows 7 ISO (Official 32-bit and 64-bit Direct Download Links)

Below is an updated the compilation of official direct download links for various versions and editions of Windows 7 ISO images in various language combination. Microsoft typically does not provide official downloads for Windows 7 operating system, neither through HTTP nor through P2P file sharing such as BT (BitTorrent). So how’s the official direct download links of Windows 7 come about?

Various web-based online storefronts and retailers (e.g. Digital River) sell Windows 7 licenses, and to fulfill the orders, the online stores host and provide digital downloads of Windows 7 setup installation files in the form of ISO image, which can then be unpacked and extracted, or used to mount on virtual drive and burnt to a DVD media disc to clean install Windows 7 on a blank PC or upgrade a system from existing operating system.
Here’s a list of available direct download links for Windows 7 ISOs. As not all editions of Windows 7 is sold online, and not all language versions is sold online, only a few editions or language versions of Windows 7 ISO images’ download links are available.
Windows 7 Professional x64 (64-bit)
English: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65805/X15-65805.iso
German: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65813/X15-65813.iso
French: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65811/X15-65811.iso
Spanish: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65843/X15-65843.iso
Windows 7 Professional x86 (32-bit)
English: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65804/X15-65804.iso
German: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65812/X15-65812.iso
French: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65810/X15-65810.iso
Spanish: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65842/X15-65842.iso
Windows 7 Home Premium x64 (64-bit)
English: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65733/X15-65733.iso
German: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65741/X15-65741.iso
French: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65738/X15-65739.iso
Spanish: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65771/X15-65771.iso
Windows 7 Home Premium x86 (32-bit)
English: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65732/X15-65732.iso
German: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65740/X15-65740.iso
French: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65738/X15-65738.iso
Spanish: http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65770/X15-65770.iso
Windows 7 Enterprise [English 60 Days Trial] – Source]
32-bit (x86): 7600.16385.090713-1255_x86fre_enterprise_en-us_EVAL_Eval_Enterprise-GRMCENEVAL_EN_DVD.iso
64-bit (x64): 7600.16385.090713-1255_x64fre_enterprise_en-us_EVAL_Eval_Enterprise-GRMCENXEVAL_EN_DVD.iso
Windows 7 Ultimate x64 (64-bit)
[Unofficial] English: http://91.121.99.184/paolo/win7-64bit.iso
Windows 7 Ultimate x86 (32-bit)
[Unofficial] English: http://91.121.99.184/paolo/win7.iso
Windows 7 N Version Direct Download Links [Windows 7 N English for Europe - No Windows Media Player (WMP12)]
Windows 7 Home Premium N x86 (32-bit): http://msft-dnl.digitalrivercontent.net/msvista/pub/X16-13457/X16-13457.iso
Windows 7 Home Premium N x64 (64-bit): http://msft-dnl.digitalrivercontent.net/msvista/pub/X16-13459/X16-13459.iso
Windows 7 Professional N x86 (32-bit): http://msft-dnl.digitalrivercontent.net/msvista/pub/X16-13548/X16-13548.iso
Windows 7 Professional N x64 (64-bit): http://msft-dnl.digitalrivercontent.net/msvista/pub/X16-13550/X16-13550.iso