When, on appeal, compensation is awarded by an affirmance, modification, or reversal of an order of the Commission, the covered employee is entitled to interest on the compensation awarded at 6% a year on each installment of compensation not paid as it:
(1) becomes payable under the award of the Commission; or
(2) would have become payable if the Commission had awarded the same amount of compensation when it passed the order from which the appeal is taken.