The latest version is 4.3.3. MARS is updated about once a quarter, and there are usually a TON of fixes. Also, the event taxonomy is often updated with each release to support the latest version of reporting devices, IDS signatures, etc. Only the sigs for Cisco IDS/IPS are updated outside of these normal patches. IMHO, for MARS to be most effective, you're going to need to keep it updated (ie. pay for support.)
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...