I bought Fallout 3 GOTY and I unfortunately have the 4GB Xbox 360 without a hard drive. So what I thought might work is this: I take a USB and my game to a friends house who has a hard drive. So I install the DLC onto his hard drive. When that is done, I transfer the DLC to my USB.
I then take my stuff back home and plug my USB into the Xbox. I load up the game and select my USB with the DLC on it (I also put my last save onto my USB so I wouldn't have to start over) and the game says something like Loading extra content. So I think it works but when you go into my game I walk around for a while and I get no new radio stations or any notifications. Did my method work or do I just need to walk around more?