Isn't the whole point that its a working emulated-Amiga setup?
Saves fiddling with setting up workbench etc. Of course not that that in itself is hard, but at least with Amiga Forever (Assuming you bought it) you have a liscensed product in the form of the o/s and kick.roms.
As far as the older versions of WINUAE/Fellow are concerned, newer versions come out faster than Cloanto can reasonably update their package (particularly relevant to the CD version). Besides theres a GUI in Amiga Forever 5 that covers this eventuality with its Update button.