Kernrechtsfrage
Whether the appeal could be entered into despite non-payment of the advance costs within the prescribed time limit and extended deadline.
Extrahierter Entscheid
No. The advance costs were not paid within the extended deadline, and no exceptional unforeseeable obstacle justified a further extension.
Extrahierte Begründung
Under Art. 62 BGG, failure to pay the advance costs after a granted grace period allows the court not to enter into the appeal. A further extension of a grace period is only possible in exceptional, unforeseeable circumstances specifically substantiated; the appellant's request for installment payments based on support and care duties did not meet that threshold.