Updated 8320 to 4.5 without Docs to Go, can't add it after the fact...

I updated to the 4.5 OS with no issues but only installed the apps that were selected by default. Then I decided I wanted Docs to Go and tried to go back with the intention of finding it listed and checking the box and just adding it to my BB But the only options given are to update the apps I already have. Is there an easy fix for this? I don't want to have to downgrade back to 4.2 and then upgrade again just to get an app...

Thx :)