I might be wrong here, but if you're trying to update Hexagon from version 1.x to 2.x you will need to buy an upgrade.
I think the free updates on DAZ site are only for minor versions, i.e. from 2.0 to 2.1.
You can find an upgrade from Hexagon 1.x to 2.5 here:
http://www.daz3d.com/i.x/shop/itemde...4&cat=339&_m=d
and it costs $49.