s3sync is a ruby based software that synchronises files from a local computer to/from Amazons S3 service.
s3sync requires ruby.
The easy solution now is to just install the gem
However, this sometimes does not work and you need to do it the long way...
Run these commands
You can get your Access Key and Secret Key from AWS user screen
Use this link to get DropBox http://db.tt/iQHWaaF