I notice you're asking for a on downloading VMware vCenter Converter Standalone 5.5 .
The official method to obtain the software has transitioned following Broadcom's acquisition of VMware. Vmware Vcenter Converter Standalone 5.5 Download --
No. The agent will fail with “Incompatible storage API.” You must use Converter 6.2 or higher. I notice you're asking for a on downloading