the sims 3 needs to have its sfo edited to 3.41. You could do that manually or you could use a manager that patches it for you. Perhaps this is not the issue for you, but its a good bet that is what is wrong.
well i have noticed this on my game as well, full retail game dumped to the hdd and it still stops at 100% so it's a compatibility issue with the game itself like it's looking to load the game after it installs the files but looks to the wrong area or never finds it.
I have it on external HDD and works fine only i can't get past character creation screen, don't know if that is an error or maby i'm forgetting something but i can't go further, but no problems with install tho.
I have ps3key latest version and latest gaia BUM with fat 30 gig ps3.
only info I can find is "version i had didnt boot first time, use the EBOOT file located in BLES01016\PS3_GAME\USRDIR put that where the normal eboot is... change sfo to 3.41... game boots perfectly and installs update + DLC" but it's worth a shot.
I wonder what they mean by putting the eboot where it was. It is where it is suppose to be. I am now looking to find out a way to make the install smaller. But having some problems finding where. Back to do some more reading. Thanks