Great news. I don't need a refund as long as I can play the game for which I paid.
I have received an update from the Store team. You should go to the game on the Store (not your download list) and re-purchase the title. There will be no charge for this, it will be a free re-purchase.
This version should download and install correctly. The working version will then be in your download list for any future redownloads in future.
If not or there are any other issues please let me know in this thread but this should be sorted now.