I can see personal licenses get the 3 years worth of updates that you've mentioned elsewhere in the comments here. However, business licenses get 1 year of use before it expires, but I can't tell if that includes upgrades from ST3 to ST4. Can you clarify what the status is for that?
Business licenses follow the traditional subscription model. The licenses don't expire, but they do get revoked once the business either revokes them or stops paying. Because of this there is no upgrade from ST3 to ST4 - it's simply included in the subscription.
