Trying to install a upgrade to my zimbra desktop 7.2.1 to 7.2.2

But I get an error message when I go to try to uninstall and then install the update

It says something about The source update is missing and it even says that when I go to uninstall the software to update

How do I uninstall zimbra 7.2.1 and put on version 7.2.2 with out this error message