Ah, that’s where you can find the release notes! Thanks. I warned of the lack of downloads and release notes for Engine DJ Desktop between 2.4.0 and 4.3.4 (OS downloads are available) over here: S6000 running n4.0.1 Isn it worth updating yet? - #8 by androphonic. I also included a link to those release notes in the Waybackmachine. The latter is no longer necessary.
Desktop 4.3.4 fixed a security bug. Surely, this is why they pulled all the other downloads.