Updated review
I initially had problems and had to power down and back on. I had to uninstall and reinstall on my iPod. After powering down again, it seems to be working fine.
The expansion pack did not show up in the second device until I clicked on okay to purchase. Then it asked if I wanted to add it to this device for free.
That said, this has excellent game play and is fun solo or with a group.
Update to the review: please add more campaigns.
Kdarm about
Catan Classic