Tomaso,
offline installers are not affected by the serious "You are unprotected" issue.
Normally, we would release new offline installer every month or so with every new version.
However, this time, we will be definitely releasing new offline installers sooner.
During the month, between big releases, we are fixing bugs using emergency updates, updating engine and virus definitions couple of times a day using the virus definition updates. Moreover, every couple of minutes, virus definitions are updated via the streaming update channel.
So, it is a generally good idea to be on-line at least sometimes to have everything up-to-date.
And yes, by fixing bugs, we sometimes introduce new bugs (like this Friday night bug). We are only human. But be assured, that we are reviewing our release and quality assurance process thoroughly, so anything similar never happens in the future.
Petr