Bootcamp Windows 7 on an iMac late 2013

I final­ly mana­ged to install Win­dows 7 on my iMac. This was not easy sin­ce not­hing work­ed as expected.

TL;DR

• You need a fair­ly new installable ISO, wich you can down­load from Micro­soft (X17-59885.iso work­ed for me: http://​msft​.digi​tal​ri​ver​con​tent​.net/​w​i​n​/​X​1​7​-​5​9​8​8​5​.​iso. Newer ver­si­on (not tes­ted) here: http://​msft​.digi​tal​ri​ver​con​tent​.net/​w​i​n​/​X​1​7​-​5​8​9​9​7​.​iso)
• Do every step of the boot­camp assistant separately.
• IMPORTANT: Let boot­camp reboot your Mac for instal­la­ti­on, or it won’t work.

Full Ver­si­on (coming soon)