I'm running 4.0.3810. When I try to install the aforementioned update, it downloads, prompts me to enter my password, and then after a few seconds, I get the following error message: "Unable to install the update." "Try to launch the installation again. If the problem persists, contact the Parallels support team for assistance." Needless to say, the problem has persisted. Anyone have any ideas? Thanks in advance.