There is a file called "INSTALL.txt" in the zip file that explains
... upload unziped files to root directory of your zencart installation
if you have a custom template installed copy
includes\templates\classic\templates\tpl_modules_shipping_estimator.php
to
includes\templates\TEMPLATE_NAME\templates\tpl_modules_shipping_estimator.php
Then go to admin > modules > shipping
locate module ozpost, click 'install'
then optimally change the default shipping methods and packaging & handling fees.
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