2.4 is finally here. Downloads are below. Changelog is here. And here is a wonderful video showcasing Fortress Forever:

Client Installer

Patch
AE Clan Hosting (.EXE)
SNT, University of Twente (EU) (.EXE)
hl2sm.com(.EXE)
FFPickup.com (.EXE)
Trepid.net (.EXE)

Full
AE Clan Hosting (.EXE)
SNT, University of Twente (EU) (.EXE)
hl2sm.com (.EXE)
FFPickup.com (.EXE)
Trepid.net (.EXE)

Server Packages

Patch
ModDB (.ZIP)
ModDB (.TAR.GZ)
AE Clan Hosting (.ZIP)
AE Clan Hosting (.TAR.GZ)
SNT, University of Twente (EU) (.ZIP)
SNT, University of Twente (EU) (.TAR.GZ)
hl2sm.com (.ZIP)
hl2sm.com (.TAR.GZ)
3pxl.com (.ZIP)
3pxl.com (.TAR.GZ)
FFPickup.com (.ZIP)
FFPickup.com (.TAR.GZ)
Trepid.net (.ZIP)
Trepid.net (.TAR.GZ)

Full
ModDB (.ZIP)
ModDB (.TAR.GZ)
AE Clan Hosting (.ZIP)
AE Clan Hosting (.TAR.GZ)
SNT, University of Twente (EU) (.ZIP)
SNT, University of Twente (EU) (.TAR.GZ)
hl2sm.com (.ZIP)
hl2sm.com (.TAR.GZ)
3pxl.com (.ZIP)
3pxl.com (.TAR.GZ)
FFPickup.com (.ZIP)
FFPickup.com (.TAR.GZ)
Trepid.net (.ZIP)
Trepid.net (.TAR.GZ)