Vmware-vcenter-converter-standalone-5.5-3 -

It cannot convert Linux machines (like SLES 11) if they are using UEFI firmware

Explains that version 5.5.3 was a critical update released to address the Shellshock (Bash) vulnerability. vmware-vcenter-converter-standalone-5.5-3

Since 5.5.3 is obsolete, consider these better modern options for legacy OS: It cannot convert Linux machines (like SLES 11)