I try with awscli local and i'v got issue too.
Finnaly I fixe issue with CURL on the full route address curl https://thinkbox-installers.s3.us-west-2.amazonaws.com/Releases/Deadline/10.2/5_10.2.1.1/Deadline-10.2.1.1-linux-installers.tar -o Deadline-10.2.1.1-linux-installers.tar
https://github.com/postwork-io/deadline_docker/blob/6813cc507fbddc2d49132eccf72a5d05c12973e3/dockerfile#LL71C32-L71C32
I try with awscli local and i'v got issue too. Finnaly I fixe issue with CURL on the full route address
curl https://thinkbox-installers.s3.us-west-2.amazonaws.com/Releases/Deadline/10.2/5_10.2.1.1/Deadline-10.2.1.1-linux-installers.tar -o Deadline-10.2.1.1-linux-installers.tar