Updating Win 7 SP1 ISO to 2016 version

Grab ISO
Extract ISO content to Working folder.
Use DISM to update the image with updates and drivers.
Use oscdimg from Windows AIK to convert your working folder back to bootable ISO.

Updates to download:
kb3020369 - Servicing Stack
kb3125574 - 2016 Convenience Rollup Update
kb2990941 - Native nvme Driver update

Download USB3.0 drivers as well to be able to install on modern systems.


Win 7 SP1 Ultimate Updated ISO: https://mega.nz/#!MFYAFIxB!8sYaIJKX3ZnLY0kaXbSZE5LU_7lwGFeVkxt07HGULck

If you don't want to update and just want to use default Microsoft image on modern hardware that uses nvme and USB 3.0 get ASUS EZ Win7 Installer. Most of the time works on other hardware as well.

https://www.asus.com/supportonly/EZ%20Installer/HelpDesk_Download/