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this is a know issue with the tool and has been filed as error DR/ER #01116354 . It will be resolved in the next patch. So I am told.
For now the workaround is to open the touchstone viewer before you open any hyperlynx tool (Boardsim or Linesim). So the viewer will grab the viewer license and you can work with the tool. As soon as the tool invokes the viewer it will open, since you have it open already.
Hope this helps.