1. Get the Service ID of the Game (just search for it or download it once on a retail ps3 and then look in the psn store)
2. Download the Package with the PSN Download Manager
3. Downgrade to 3.55
4. QA Flag the PS3 (you need to do this only once, it will stay after down/upgrade)
5. Install the retail PKG
6. Upgrade to 4.11
Just use the Awesome-Update-Finder-0.3 Application, download the Update, unpack it with Mathieulh's tool and copy the content of the PKG with an ftp or the Target Manager to the PS3.
Atm there's no other way to do it, but there's an easier way: