Windows Assessment and Deployment Kit 8.1 - Install Issue

Hit this error recently, attempting to install ADK 8.1 on my Windows 7 SP1 VM:

• Downloaded the source files for installation at a later time - ok success
• Copied the source files including the adksetup.exe to my VM for installation. 

• Run the adksetup.exe (as administrator)
• FAILS with the following in the log file.

"Image path is [\??\C:\Program Files (x86)\Windows Kits\8.0\Assessment and Deployment Kit\Deployment Tools\amd64\DISM\wimmount.sys]
Could not acquire privileges; GLE=0x514
Returning status 0x514"

• I had to remove the system from the domain and then run the install as the local administrator. Even logging on as the local admin whilst on the domain did not work.