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This is a pretty cool extension if you are looking out for an offer of free shipping for different-zones/locations as it helps to implement the same offer without any hassle based on the total value purchased.

This will not overwrite any files and is for versions: v1.5.0, v1.5.0.1, v1.5.0.2, v1.5.0.3, v1.5.0.4, v1.5.0.5, v1.5.1, v1.5.1.1, v1.5.1.2, v1.5.1.3

Download from opencart.com extensions type Flat Rate Plus Free in search box to find.