Uninstalled and downloaded manual setup.  Now works.
SupportAssist has been useful in the past.  Tonight I started it up and it asked to update itself.  I let it.  The new version is 2.2.0.253 .  It no longer works.  The link in program groups for Supportassist invokes: "C:\Program Files\Dell\SupportAssistAgent\bin\SupportAssistInstaller.exe" launchui But all I get is a window that pops up and says support assist is already installed and terminates.
SupportAssist 2.2.0.253 updated automatically and now no longer works