You can upgrade from any 3.x version of the Active Directory driver. Upgrading a pre-3.x version of the driver directly to version 4.5 is not supported.
NOTE:If you upgrade to version 4.5 of the Active Directory driver, you need the Identity Manager 4.5-based Product Activation Credential in order to be able to use the upgraded driver. The activation level has been increased due to the addition of an additional feature.