Here are the release note for Version 2.4d. As always all versions I am able to build myself, that is DOS, Aix, SunOS, Solaris and HPUX are made available at the same time.
Sources are also available for the other platforms.
This is not a major upgrade, so you may choose not to bother to update your copy yet. It does however add a number of new features, some of which are rather browser specific, and provides an updated manual, which may be worth obtaining as it incorporates all of the recent release notes and changes. WP6 files containing Graphic images which were OLE links failed. This cause Wp2Html to mis-read the image name. This has been fixed.