EN X3 Upgrade

The DVD version of X3 doesn’t say whether it is for MAC or Windows. It has both the operating requirements, so I assume it is for both. A friend is claiming the DVD upgrade doesn’t work for his MAC. What’s the scoop.

Don’t know, but my X4 copy clearly says Windows on it, so I thought you got one or the other, but not both.  (and if you used the upgrade then it would be copyright infridgment for your friend to use it too)