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  1. Open TransformView then disable all IK.
  2. Select the bone you want to scale.
  3. Enter the number in the box and click the arrow button to apply to all axes.
  4. Click Scale to scale. Do this for other bones as well.
  5. Click Update Model -Curent Deformed State- to apply the edit.

credit: Appearance Miku by ままま、アラン・スミシー