Download: https://sourceforge.net/projects/nhcontrib/files/NHibernate.Envers/1.2GA/
Nuget: http://nuget.org/packages/NHibernate.Envers
Documentação: http://envers.bitbucket.org/
Release notes: https://bitbucket.org/RogerKratz/nhibernate.envers/src/4fc1063281cf/Src/ReleaseNotes.txt