If you had firmware 1.13.17 or earlier, you won't have it. You need to apply the ESN loader fix first, then you would get the firmware and updater. It is a little confusing but once you've gone through it once, it's actually pretty easy.
You would first need to register your 396 and 996 on the Uniden website.
I have 103.11 in the 396 t i have owned for a year and yes i am stupid . I have never seen a download so crazy and don't know what i am doing. I will pay anybody 30 .00 an hour cash to come to me and figure this stupid thing out or i am going to sell the 996 T i just got in the mail yesterday as i have 6 scanners and most of them are pro 96 or 2096 and no problem with radio shack
John, read this sticky 'BCD396T and BCD996T Updates are Here' in this forum - it will be either the first or last message (depending on how you set up your defaults for this site) where UPMan talks about the various steps you need to execute.