How do I get Windows installation image to create a virtual machine?
To download an .iso file just choose the needed OS in the Microsoft web page. To download an installation file for Windows 7 you will have to enter the product key firstly.
Note: Please open the link from Mac side (fro any Mac browser), choose the edition and confirm that, choose the product language and confirm it too. The link will be generated automatically.
Once an .iso file will be downloaded on your Mac, check instructions from the article to create a virtual machine (steps 2-7).