This is a general suggestion for the tools. Like some folks I got the 14.4 WebPack tools in with my Zedboard, it suggested I download 14.5 (which I did 5.9GB even with a 6MB download line takes hours) and I installed it and when it ran it suggested I download 14.6 (which I did, another 6GB) and I installed it too. Now I have 14.4, 14.5, and 14.6 installed (which makes me happy that I have 1TB of space on my C drive but you know where I'm going here ...)
My suggestion is that you offer to take previous versions off the system. I realize that you don't want to do that by default since some folks license is only valid for an older version but you could offer :-).
--Chuck