In light of the FedEx Ship Manager API shut down we are working on an update to the module to port it to the new web services.
As outlined here, all merchants will need to migrate their api accounts: http://www.fedex.com/us/developer/migration.html
The new module will have links to fedex.com setup your new API credentials.
This affects all FedEx merchants and all Loaded Commerce and cre loaded merchants.
The module will be a free download on our site.
The module requires more modern server requirements like SOAP and php 5.3.1+ due to the fedex web services requirements.
Upgrading to 6.5 will be the best way to ensure smooth operating of the module in the required server environment. We cannot guarantee that older versions of the cart will run as expected on php 5.3.1 servers.
We will notify all customers next week when the module is ready for download