See the original thread here.
This PC Tool allow you to install PSN content to your PS3, without having to acces your account. It is needed that you have acces to the PS3's Hard Drive.
Demo Manager v1.0
Installing and Preparing Demo Manager 1.0
1. Download Demo Manager 1.0 and and copy demomanager.exe to any folder you want.
2. Download any demo you want but remember that is has to be .PKG