Questão jurídica principal
Whether the appeal had to be entertained despite non-payment of the advance costs within the set deadline.
Decisão extraída
No. The appeal was not entered into because the required advance costs were not paid or duly evidenced within the non-extendable deadline.
Fundamentação extraída
After a valid warning under Art. 62(3) BGG, the appellant neither paid the advance in time nor provided the required proof of timely payment; the later request for legal aid was filed too late and did not affect the deadline.