Rick is 99.9% correct, but that last .1% to be signifficant.
A number of people reported having to run the old process a few times before it really updated the collection.
The new process checks and identifies what needs to be downloadedd, the first time around.
Then when you view yur collection in list mode, it will idenify the cards that have been updated and give you a download option. This new download will only update the individual animations that have changed.