New
#11
Well, may I suggest something? If your applications can run on both Windows 7 and 10, you can make a "master" disk with Windows 7 that will have all the software installed and configured as required. During the clean installation of Windows 7 skip entering the key and after installation is complete, do not activate yet. Install every single software you will need. Then clone that "master" disk into the rest disks. Boot every computer in Windows 7, change the computer name as appropriate, enter your key for that computer and activate. Then use a DVD-ROM to upgrade to Windows 10 to avoid waiting for the download from Get Windows 10 utility. After you upgrade to Windows 10 it will be automatically activated. Yes, you have to upgrade each computer to Windows 10, but you at least don't have to manually install every single application again. A better option would be to install Windows 10 directly and clone that, but then you would not be able to activate without a Windows 10 key...
Since Windows 7 installation will be fresh, I don't see the reason for a clean install of Windows 10. However, if you insist, you could change the process so you install Windows 7 without key on the "master disk" Then clone that disk to the others. Run Windows 7 in each computer type the key and activate. Upgrade to Windows 10 and activate. The key is stored at Microsoft server for the specific hardware. Then format and clean install Windows 10 to "master" disk without entering a key. Make sure you select the correct version, Home or Pro and that you are disconnected from the internet. Install every single software you will need. If you need to update it, don't, you'll do that later or use an offline update file when possible. When ready, clone the "master" disk to the other disks. Load Windows 10 and connect to the internet to activate. That's it! But it is a lot of work and I don't think is worth the trouble for a clean install. I see no benefit anyway. I would go for the first method.