This is a computer application. It will always have to revise and update for free, as do all the rest. Changes in different operating systems can cause instability, as well as upgrades in computer’s potential along with monitor’s resolution, and great software engineers will adapt as necessary for the evolution of the product and to keep customers happy and current.
Zbrush isn’t at ZB5 64bit yet…
To give a complete product update like ZB5 is EPIC! Because most companies will capitalize on complete product upgrades.
So it is expected for a revision to be free after purchase.
ZB4… ZB4R5… ZB4R6… ZB4R8
Maya 2014… Maya 2014 sp1… Maya 2014 sp2… Maya 2014 Ext1
Most of the time they plan to have these tools included but it’s tuff to release all ideas at deadline… or they discover problems, glitches, like with Yosemite…
I’m not speaking from a “what I know” perspective.
I’m speaking from a “common sense consumer expectation” type of perspective…