From time to time users come through asking for downloads for various Windows OS downloads weather it be 7, 8.1 or 10, This is possible to do from Microsoft themselves using media creation tools. You can links below with instructions on how to create media.
Are these ISOs still available since the free Windows 10 offer has finished? Also be aware that for the Windows 7 download you will need the RETAIL product number although it has worked for me using the product number off the Microsoft sticker. Either way you will need a product number of some sort for the Windows 7 ISO.