LexActivator on Windows Server 2012 R2

I have an issue using LexActivator.GetFeatureEntitlements() on windows server 2012.
I use the latest version of both unmanaged LexActivator.dll (3.34.1, the file report 3.0.0.0) and wrapper Cryptlex.LexActivator.dll (nuGet indicate v3.34.1, the file has 1.0.0.0).
As the documentation should work also on ws 2012.