Questão jurídica principal
Whether the appeal had to be declared inadmissible because the advance on costs was not paid in time.
Decisão extraída
Yes. The advance was not paid within the non-extendable deadline, so the appeal was inadmissible.
Fundamentação extraída
The time limit ran from expiry of the postal collection period under Art. 44(2) LTF. Redirecting mail to poste restante did not change this. The later request for extension was refused, and the advance still remained unpaid.