OAK 4, a major upgrade to the product, was released on 8 April 2009.
The latest version of OAK, version 4.20.000, released on 10 October 2011, introduces a new feature, implements various bugfixes and
performance upgrades, and amendments to the help (offline, online and printable PDF).
New features include:
Users of prior versions of OAK 4 will be automatically offered the chance to install the new version by OAK’s automatic updating feature.
There is a detailed version history of OAK in the online documentation.