There is no popup thing right now, it was planned though. You can however script it yourself, something like this (calling update() is downloading it):
PHP Code:
printPackage(getBasePackage());
function printPackage(package) {
echo("package: " @ package.filename @ " - " @ package.name);
if (package.filename=="mymusic.gupd" &&
package.localversion<package.version)
package.update();
for (temp.subpackage: package.packages)
printPackage(temp.subpackage);
}