If you install the canada post module and get an error that you need measure units module this can be found in your account on our website. This module needs to be installed for canada post to work. Navigate to your account and select My Downloadable Products.
Once you're in the my downloadable products you will see the modules you've purchased and also the Measure units module you need for the canada post module. Download and install this module.
Below is a link to the product page to show how to configure the module.