Migrate win7 bootable DVD to USB

I just built PC for my friend but the bootable USB he has seems to be corrupted, I have bootable DVD bud he doesn't have optical drive. We have both really slow internet so I wonder if it is possible to just migrate DVD to USB or if I have to download it again (I don't have the ISO anymore)

To create a bootable USB: https://rufus.akeo.ie/

To turn the DVD into an ISO file: https://cdburnerxp.se/en/home