A few tips when ordering expansion pack(s)
Log in and make sure turbine account info is correct.

You'll have to create a new Digitalriver account.
DON'T use any turbine account passwords, (it creates an error)
Make sure you have the correct package, (my 1st try had the Legendary upgrade added)

It works the same as MotU ordering after that, and you'll get the email confirm with product key (known as digital rights)