As much as I’ve harped on installing and running stuff with vCO, the one thing I haven’t touched on much to date has been where to get the bloody download bits.
Unfortunately as I’m writing this there is not a product specific download page for vCO. Rather you will need to download the entire vCenter bundle, and hidden within is the vCO download bits:
C:\Download\VMware-VIMSetup-all-4.1.0-345042\vpx\vCO
With any luck they’ll break out into their own download page in the near-ish future.