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Working Solution
On the command line:
vssadmin List Shadows
This will show you a list of your shadow copies (the shadow of the CSC folder will not be locked). Look for and copy the highest numbered original address.
Secondly we make a link to the shadow copy:
mklink /D C:\LatestShadow \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy417\
The rightmost part of that should be the original address you copied before
Next use robocopy to get all the files out of the cache
mkdir C:\CSC_copy
robocopy C:\LatestShadow\Windows\CSC C:\CSC_copy /E /ZB /COPY:DT
You should end up with a copy of all the cache files in C:\CSC_Copy.