In version 26.4 licensing has been moved into the driver. Instead of copying the XML file, please use the following registry file or set the value using your deployment tools:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SPVVEngine\Options]
"License"="YOUR-LICENSE-KEY-HERE-AS-A-SINGLE-LINE-WITHOUT-MARKERS"
You will also see it there after entering the licence in the GUI.