I think it is fair to say that most customers whether they are business or consumer have a responsibility of their own to research to a certain extent. it won't always just fall into your lap. Just curious on what the expectation from your position is on how this information should be routed? Email every customer on product updates/releases by default? At a certain point, due diligence is required IMO. I see the same standard across any other AV or software company, it requires you to search up the release notes or updates. IMO I am able to find everything that I need regarding updates/releases/support pretty easily, yeah it may take me looking in a few places but in reality it isn't something that consumes more than a few minutes of time, let alone hours. You can always contact your local ESET support team, it may not require a ticket or anything major, but a simple question of 'Is this supported?' or 'When was this released?'.
I surely would not want to receive any email/contact without my consent. So ESET gives you the option to sign up for newsletter emails.
EDIT: ESET Business customers also receive auto-updates for the products, so as long as you do your due diligence to enable this and ensure machines meet the requirements.