For the sake of sane cross-platform development, we've dropped off .NET 4.5.2 as a target - only 4.6 onwards, via .NET Standard 1.3, is supported
UserEntity.IsAdministrator and ApiKey.CanActAsPrincipal have been hard-removed in favor of the new roles/permissions system; we decided against attempting backward compatibility in the API and client around these points, because of the potential for introducing security issues when mapping between the old and new permissions systems
There are various minor source/binary breaking changes, where methods signatures or properties have changed to match the newer API
There are some breaking changes, here.
UserEntity.IsAdministratorandApiKey.CanActAsPrincipalhave been hard-removed in favor of the new roles/permissions system; we decided against attempting backward compatibility in the API and client around these points, because of the potential for introducing security issues when mapping between the old and new permissions systems