Download an entire S3 bucket

You can download a S3 Bucket using AWS CLI, first of all install it using the pip.

pip install awscli

When the installation is completed run aws configure to setup the credentials

aws configure

You will be asked to enter the Key ID and Access Key

AWS Access Key ID [None]: *******
AWS Secret Access Key [None]: *****
Default region name [None]: YOUR_REGION
Default output format [None]: 

And finally

aws s3 sync s3://your-bucket-name .