Help Can't download Kindle from MP after 2.3.5 install in Nook


I am new to the Nook Color and Android in general. Got my NookC the other day and followed some steps to get it running gingerbread - which it is at the moment. However, I want to download Amazon Kindle from MarketPlace. I can see the App but there is no option for download like with the other apps.

I am not sure what to look at ... any pointers?