You cannot install the VMware Data Recovery plug in the same way you install the Converter or VUM plug ins. You can't just add it through plug in manager. You have to install it directly from the ISO. Would be nice, if that was mentioned in the docs. C'est la vie.
http://www.vmware.com/pdf/vdr_10_admin.pdf
http://vmware.com/files/pdf/data-recovery-evaluators-guide.pdf
http://www.vmware.com/pdf/vdr_10_admin.pdf
http://vmware.com/files/pdf/data-recovery-evaluators-guide.pdf