http://iscoresports.com/

I already purchased the score and the add on for the MLB rosters . I have to re download everything how do I do that without paying for it all over again

For iOS devices, re download the app from the apple app store. If you do with original apple I'd, you will not get recharged.

For MLB Rosters, if you are re-downloading on the same device, they will automatically be activated. If it is a new device, do an Options -> Export, and email us the Customer ID from your old and new device, and we can transfer the rosters over.