Question juridique clé
Whether the appeal had to be entered into despite non-payment of the cost advance.
Solution extraite
No. The appeal could not be considered because the appellant did not pay the advance or provide proof of timely payment within the deadline.
Motifs extraits
After a grace period under Art. 62(3) BGG and an express warning, failure to comply triggered non-entry under Art. 108(1)(a) BGG.