1.You must have the internet on your system.
2.Once you have completed the Internet set up click on THE PlayStation Store located on the main menu.
3.Once you have completed the following find the menu located on the left hand side of the screen and click on demos
4. Download the demo you want to play
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Your PS3 needs an internet connection and you can download demos for free on the PlayStation Network.
The Playstation Store is the only authorized download site for the PS3 and they rarely have free games except demos. While Playstation Plus members have free games it is with a paid membership and the games expire with the membership.
A PS3 game download can be paused by clicking "Download in Background." The PS3 can also be shut off, and when it is turned back on the download will resume.
You sure can
PS3 can not play computer games so just download them on the computer