Instructions
Select the "PlayStation Store" option on your PS3's main menu.
Select "Add-Ons" in the PlayStation Network Store.
Select "A to M" on the list of options at appear on-screen. Select "C," followed by "Call of Duty: Black Ops."
Select "Escalation" from the on-screen list, bringing you its store page.
Select "Download" to install them onto your hard drive. This automatically adds them to the game, so the next time you play "Black Ops," the maps will already be there.