[CrackBerry Question]

I have always used Amazon MP3 player on my BBs, but I can't find it in BB World; I'm assuming that it isn't compatible with the new OS, as it isn't available on the Amazon App Store, either. As a work around, I tried to use my computer to load my recent purchases onto my SD card, but it wouldn't work. Again, is there something I need to do as a result of installing the new OS? (When I plugged my phone into the USB for the first time after the upgrade, it gave me multiple prompts, so for all I know I chose incorrectly and jacked the install up...a tech wiz I am not...) Anyway, thanks to anyone who can assist!