A new HP-VMware depot has been launch and you can get/download your ISO/Agent from there.
From The HP VMware Engineering Team
– New online depot for use with VMware ImageBuilder and VMware Update Manager (http://vibsdepot.hp.com/)
– Support for customer created images that include HP management components
– Over 110 servers configurations listed on the VMware HCL (http://www.vmware.com/resources/compatibility/search.php)
– The HP support matrix has been updated to include our server support for ESXi 5.0 (http://h18004.www1.hp.com/products/servers/vmware/supportmatrix/hpvmware.html)