I'm sure our PS3 and KO game enthusiastics will provide you with detailed help but ... Stackers' Lounge forum
How to download & Play Demo games in PS3
I'm sure our PS3 and KO game enthusiastics will provide you with detailed help but for now I'll share a solution I came across online:
Follow these simple instructions:
1- Turn on your Playstation 3 console.
2- Scroll right to the Network menu and choose "PLAYSTATION Store."
3- Using the left joystick to move the cursor, click on "Games."
4- Click on "Game Demos."
5- Click on the left and right arrows until you see a game you would like to download. Click on that game's icon with the cursor.
6- Click "Download." The demo will begin to download. Click "Perform in Background" to continue browsing, or to leave the PlayStation Store.
7- Repeat Steps 5 and 6 if there are other demos you wish to download. You can download more than one thing at once, and you can manage your downloads in "Download Management" in the Network Menu.
8- When a game is finished downloading, you can install it by clicking on the game icon in the Game section of the Main Menu.
ps3 downloads <-.-> downloadable ps3 games