Methods and apparatus, including computer program products, for delivering resources for installation on a machine involves receiving a first request from one or more installer components requesting one or more requested installation resources. A second request is sent, in response to the first request, for the one or more requested installation resources to multiple service providers. One or more installation resources are obtained from the service providers. The obtained installation resources correspond to the requested installation resources and are obtained as a result of the second request. The obtained installation resources are delivered to the installer components.