No, the chart tool add-ins only have to be installed on the machine in which
you are working to add the labels. I forgot to add another way to customize
data labels . . .
You can also click inside of the individual data label and
then add a reference to a cell. For example, you can click inside of the
data label and add a reference like this to the formula bar:
=Sheet1!$A$3
Whatever you enter into cell A3 will be reflected in the data label.
This method will allow the data labels to be tied to a cell. The label will
update when the cell value is changed.