Hello there,
I notice that you mentioned “in business environment”. So are your computers Win7 Enterprise edition? If so, you shall enter Volume License Service Center to download and purchase the key.
https://www.microsoft.com/licensing/servicecenter/default.aspx
In other situations, check beneath links for reference:
To see if there is a path
https://learn.microsoft.com/en-us/windows/deployment/upgrade/windows-10-upgrade-paths
Create installation media for Windows Instruction
https://support.microsoft.com/en-us/windows/create-installation-media-for-windows-99a58364-8c02-206f-aa6f-40c3b507420d
Best Regards,
Samson Peng