it might be because of your Os.. for intense when i go to the blackberry webisite their tell me the same but i know it supports my phone.. just the os is not release yet and they dont want to have customer issue so they locked it since they can know the os you have ..
try to find the direct link (ota), that what i always do and it should work without a doubt.. on my side i have javatalk that support all the os for the curve and it has AOL as well , you can try for free on trial period
I got it to download on my 8330 but when I'd try to sign in it would tell me to go back to the website, which wouldn't get me anywhere. I think they're waiting on an official full release of the client...
Posted from my CrackBerry at wapforums.crackberry.com