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I installed the app on my SD card but can still only download to the internal storage.
Deleting the file in "currently unavailable" (it was a streaming file) worked for me too.
It is very easy. Just call Comcast and they do it in minutes. They just have to pair your existing card to your new Box. I would make sure you are...
I just got the 10 year deal. TiVo Roamio Plus with lifetime for $499. Box arrives today!