This is the most recent version that is still playable on disc. It is not, however, the most recent version of the mod, and it is highly recommended that you get the STEAM version of EaW/FoC and play it on the workshop.
This is the most up to date full version of the mod which is playable on unpatched versions of EaW/FoC. It is not, however, the most recent version of Absolute Chaos and it is vastly inferior to the current STEAM version of the mod which can be previewed and accessed here.
Why is this? In 2018, Petroglyph patched EaW/FoC so that the save mechanics would work properly. This patch, as well two other more minor patches, are currently available only for STEAM users, unfortunately. Consequently, the most recent version of the mod is being released only on STEAM, because only that format is capable of handling a mod of its size and scope. If Petroglyph ever brings the disc version of the mod up to speed with a patch of its own, you can rest assured that the most recent versions of Absolute Chaos will be hosted here and updated regularly. So for now, consider this version a playable demo or a teaser to whet your appetite for the complete mod which currently accessible only on STEAM. Until then, it is strongly advised that all disc users upgrade to STEAM, which is now the exclusive platform for most of the premium quality EaW mods still in development.