Brother TD-2120N - Manual (Page 82)

Updating P-touch Editor (all models) / Updating the Firmware (TD-2020/2120N/2130N only)
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b
Click the [Computer software update] icon.
c
Select the [Printer] and [Language], select the check box next to P-touch Editor and then click [Install].
d
A message is displayed to indicate that installation has finished.