I played a bit now with the installer..
Extracted all the files and found that, aside from changelog and mission list, all other files are actually old..
Even the new credit photo in DATA/CREDITOS/8.jpg is not actually new and still shows 2.4
So I feel that my system does not have an issue.. I even merged the files manually one by one .. and I'm still not getting the latest update.
Am I missing something?