I originally owned a Hero and followed the instructions from ASUS site for Win 7 install, OS disk in USB DVD drive, motherboard driver disk in SATA drive, Windows will pick the proper USB drivers from the motherboard disk I believe automatically, maybe I had to point it to the USB driver and install it first, then the thumb drive with NVME drivers, it has been awhile.or you can use the EZ Installer to create a copy of Win 7 with the USB drivers, you can find this in the utilities section on the download site, If you have a case with USB 2 that connects to the motherboard may be useful, also I looked in an old motherboard box that had a pcie USB 2 adapter that connects to the motherboard and found it usefull
Anyway if you looked way back at some of the first posts for MVIII boards here in these forums there are many threads on installing Win 7