Get the original vanilla minecraft server.jar and get the paper.jar in the same version (e.g. 1.8.8). I recommend using this service but proceed with caution as it technically goes against ToS of MC: https://jars.vexyhost.com/
Instead of letting paper try to download from aws we will redirect it to our server.jar
danlp6@danlp6fw:~/Downloads/paper\ Hi DanLP6 Sat, 21 Jun 2025 00:27:28 +0200 56.800°C :$ java -jar paper-1.8.8-443.jar
Downloading original jar...
Error downloading original jar
java.net.UnknownHostException: s3.amazonaws.com