actually, AB will also auto-notify you of updates.....maybe not the second they come out, but it will let you know when the debuged versions are ready, and autoupdate if you ask it to.
but as said before....CHECK your work, AB does still make errors. also DoW is not availible and some special characters don't work right. watch out for crack copies, have heard of many complaints of them not working with beta 3.
again, remember to check your work! many players have come to me at tournies and said "but Army Builder let me build that army". it ends up there is some math error due to an item reducing the cost of a unit, or some other wierd glitch.