Currently the only official way of downloading Windows 7 ISO image is by visiting Windows 7 Disc Images website and providing valid license key. There is no official way to download these images, if you don’t have a key. Fortunately raymond.cc brought a nifty workaround, found by one of the Russian groups of net-freaks.
Because raymond.cc’s blog posts contains a lot of totally unimportant blah-blah with a lot of not needed screenshot for mentally disabled (i.e. idiots) and a few more stupid things (like stupidly opening links in another tab after even more stupid redirect to some dully disclaimer page), I decided to write my own, greatly reduced version of this workaround.