It seems that the actual location of the file varies from installation to installation, so its better to find the exact location of the file in your system:

    # cd /                                                                                              
    # find -name "aws_zsh*" 
    ./usr/local/bin/aws_zsh_completer.sh

It seems that the actual location of the file varies from installation to installation, so it's better to find the exact location of the file in your system:

cd /                                                                                              
find -name "aws_zsh*" 
./usr/local/bin/aws_zsh_completer.sh