This issue occurs because the relative path to patches has changed.
Updated metadata was released for this issue on June 24, 2011.
If you experience this issue after June 24, 2011, perform a Patch Download Task in VMware Update Manager.
To perform a Patch Download Task:
Choose Update Manager from Home/Solutions and Applications.
Click the Configuration tab.
Select Patch Download Settings.
Click the Download Now button.
Based on VMware KB 2001631