How to upgrade vco 5.1 to 5.1.2

Hi All,

I want to upgrade VCO from 5.1.0 build 2725 to 5.1.2, vco is installed in the same machine as vcenter. The reason is, i'm not getting inventory info from Host object with below code

myClusterOverallCpuUsage += myVcHostSystem.summary.quickStats.overallCpuUsage;

myClusterOverallMemoryUsage += myVcHostSystem.summary.quickStats.overallMemoryUsage;

The above code always returns zero (0).

So i thought to upgrade to 5.1.2, but the challenge is, i didn't found any downloadable patch for this and there is no https://<appliance-ip>:5480 to upgrade too.. Does anyone faced this issue & have the solution? How do i upgrade to 5.1.2?