You can upgrade from vROPs 6.4 to vROPs 6.6. Please go through release notes http://pubs.vmware.com/Release_Notes/en/vrops/66/vrops-66-release-notes.html, section - Installing and Updating vRealize Operations Manager
rstankova how can you say that UM 3.6.x supports vROPS 6.6?
vCloud Usage Meter cannot discover vRealize Operations Manager 6.6
vRealize Operations Manager 6.6 does not include a vSphere Web Client plugin. As a result, vRealize Operations Manager does not register itself as a plugin to the associated vCenter Server and is not present in the extension manager of the vCenter Server. When you add a vCenter Server to be metered, vCloud Usage Meter is not able to discover the associated vRealize Operations Manager.
My UM 3.6 is unable to meter vROPS 6.6.1
I did a fresh installation of UM 126.96.36.199 and it is working. But i now have missing data from beginning of october.
Hi dear Customer,
As it's state in mine and next reply the metered vROPs version is 6.6.1 and we provide you the VMware Product Interoperability Matrices where you can check the integration between the products.
let me know if any questions.