Monte o ISO e use o comando powershell Get-WindowsImage no install.wim. A Versão deve ser o que você deseja.
PS C:\users> Get-WindowsImage -ImagePath h:\sources\install.wim -Index 1
ImageIndex : 1
ImageName : Windows 10 Enterprise
ImageDescription : Windows 10 Enterprise
ImageSize : 15,292,901,009 bytes
WIMBoot : False
Architecture : x64
Hal :
Version : 10.0.15063.0
SPBuild : 0
SPLevel : 0
EditionId : Enterprise
InstallationType : Client
ProductType : WinNT
ProductSuite : Terminal Server
SystemRoot : WINDOWS
DirectoryCount : 19668
FileCount : 101858
CreatedTime : 3/18/2017 7:58:23 PM
ModifiedTime : 3/18/2017 8:26:40 PM
Languages : en-US (Default)