Have I lost my software update forever?

Ok, so i bought the january software update for my iPod Touch and everything was great. Then i tried installing boot-camp and it said i had a disk error so i wiped my mac disk and re-installed leopard.
Then i reset my ipod (it was acting up) and restored it, when i plugged it back in to sync the software update didn’t go back on the ipod and so now i’m stuck without the update and $25 less out of my pocket. it there any way to get it back without paying; AND i am signed into my itunes account with the same user as i was when i bought the update.