A silly and maybe stupid question , but first of all , great work with the Linux version it scans every directory without problems, so my congrats to the dev team
I was wondering why the update definition file isn't incremental as it's Windows based sibling?
I'll be grateful for any feedback
Thanks in advance
MiguelAngelXP 
Hallo,
the (full) incremental update mechanism was primarily designed for Windows-version of Avast. Thus, the update scenario contains some techniques that aren't very suitable for the unix update philosophy (executable per-version updater which rewrites itself, hardcoded dependences between binaries, some chicken-egg issues etc.). But, this code is avalable for nixes too, as beta, and will appear in the very next Avast! for Mac edition release.
In the case that you need 400.vps-update only the things aren't so complicated (because the incremental update binary serves as "better 400.vps-downloader" only) - you might try this package for now -
http://public.avast.com/~cimbal/inc_vps0.tgz - see readme for details. Yes, it is cryptic a bit, indeed, but this is how the mechanism works :>.
If you have some questions/suggestions/comments, feel free to write them here (until 16.aug I can't read my e-mails on daily basis easily).
regards,
pc