First my music wasn't working. Every time I tried to play a song a blue box appeared advertising the premium feature So I uninstalled the app. When I tried to reinstall it said installation error (-504). When I tried to download the installer a message popped up saying that the file couldn't be opened. Please help!
I have one solution in mind, but you'll need to look for it in other places. Search for a Spotify apk, the package through where you install Android apps, download it to your phone and install it. Then go to the store, and try updating to the latest version.