Hi Raj,
Please check my original reply on your question there I explained the process of hdblcm_prepare. Other option is to manually upgrade the host agent manually.
I would first check the version of your hostagent with "/usr/sap/hostctrl/exe/saphostexec -version" if that version is the same as what you try to install then you know that your agent is already up to date. Otherwise I would try the hdblcm_prepare option mentioned earlier or update it manually (see Upgrading SAP Host Agent Manually - SAP Host Agent - SAP Library)
Kind Regards,
Nico