Go to VMware's website, go to the "Downloads" section, click on "vSphere 4" and scroll down until you see "VMware Data Recovery", click on the "Download" button.
Accept the EULA and download the ISO. Once downloaded, extract the ISO (I use 7zip)
Go into your vCenter and go to "File" then "Deploy OVF Template..."
Browse out to where the ISO was extracted to and select the ovf file in the VMwareDataRecovery-ovf-i386 folder, then click "Next"
Verify the information, then click "Next"
Select the name and add it to where it should go (the cluster in this case)
Select the cluster and then the individual host
Select the Datastore to store the files and the format of the disk
Select the Network it should be on
Select the Timezone
Verify the information and click "Finish"
Wait for the system to be successfully deployed
With the appliance installed, the plugin for vCenter will now be needed. To install it go back to the extracted ISO folder, run the "VMwareDataRecoveryPlugin.msi"
Click "Next", "Next", "Next", choose "I Agree" and "Next", "Next", "Close"
Once installed, by clicking on the "Plug-ins" through vCenter and then "Manage Plug-ins", the Plug-in Manager should look similar to this: