Hi there,
I am little confused with installing the CP shipping module...
I have upgraded to ZenCart 1.3.9d (from v1.3.9c) yesterday. I just installed v1.3.9c not long ago and I was just learning how to get around so none of files were customized so I printed out changelog files and simply copied to my site.

Now, I am trying to install CP Shipping module and I got confused. I downloaded the file named canada_post_shipping_module_1-3-8c (I think this is the latest one available?!) and came with instrustion doc says "v1.3.7. and I uploaded new files listed but I noticed some of the listed files need to be overwritten.

I just copied the same files yesterday (namely
admin/includes/modules/product/collect_info.php
includes/classes/shopping_cart.php )
in order to upgrade to v.1.3.9 so I am not sure if I can upload the same name and overwrite these files...

Also, other files:
admin/includes/modules/copy_to_confirm.php
admin/includes/modules/update_product.php
admin/includes/modules/product/preview_info.php (if I copy this file, file size will be from 9,501(1.3.9d) to 9,319 (1.3.8c??).

Can I just override to my 1.3.9d files???
Any help for newbie will be greatly appreciated.