Whether the appeal could be heard despite non-payment of the ordered advance of costs
No; the appellant failed to pay the required advance within the time limit and did not show any excusable reason or timely payment.
Under Art. 69(1bis) LAI and Art. 47(3) LPA-VD, the court may require an advance of costs and warn that failure to pay leads to non-entry into the matter. The appellant neither paid in time nor replied to the court's later notice.