VHD2WIN - older client?

I am trying to use VHD2WIN, but the only script I can find to download is Convert-WindowsImage.ps1.  The problem is I have a Windows 7 client, and I am getting the error 'Could not load file or assembly 'System.Linq', I understand this is because my client is not Windows 8.x.

Any one know where I can grab an older version of VHD2WIN or Convert-WindowsImage.PS1 that supports Windows 7?  Thanks!