Upgrading to Heroic Isengard and Rohan Edition?

Greetings,

neither Rohan nor Isengard Heroic or Legendary Editions seem to be available from the market. I did however find another site which does offer them;
http://www.gamestop.com/pc/games/lor...edition/106113

My question now; is this legitimate? Will Turbine accept this version? Furthermore, I have the base Isengard Edition already, but is it possible to upgrade it to a 'better' version still?

Thanks.

Turbine will accept them. I could not find Rise of Isengard being sold by Gamestop. The links are all bad. You could buy:
http://www.gamestop.com/pc/games/lor...edition/106113
if you wanted. No idea how much longer Gamestop will be selling this digital product. At some point Gamestop will switch to a Helms Deep product.