While we prefer that everyone use the latest release:
http://www.rdio.com/media/static/developer/ios/rdio-ios.tar.gz
You can access previous releases:
http://www.rdio.com/media/static/developer/ios/releases/rdio-ios-1.0.tar.gz
http://www.rdio.com/media/static/developer/ios/releases/rdio-ios-1.1.tar.gz
http://www.rdio.com/media/static/developer/ios/releases/rdio-ios-1.2.tar.gz
http://www.rdio.com/media/static/developer/ios/releases/rdio-ios-1.3.0.tar.gz