"Did you put the original backup on the SD card, before you did the download with the Discovercare manager?
No I had the latest files on the card I think. It said I have the latest version."
It is important that you start the Discovercare Manager with the original contents on the SD card.
I think it choses the correct update on base of the contents of the SD-card.
In your case it must say that there is a update for you.
I still think the PRO file are not the right option. Probably the 8 Gb part is still to big for you SD card.
Peter