How to install it:
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1) Unzip and upload the contents to the root directory of your OpenCart installation, preserving directory structure
2) From the admin menu, go to 'Admin->Users->User Groups'. Edit Top Administrator.
3) Find and check the entries for shiping/specificdate in both modify and access. save.
4) From the admin menu, go to 'Extensions->Shipping'.
5) Install the module, and click edit to configure.