Hi Will,
You'll want to upgrade your ClickDimensions version after you upgrade up to CRM 2015. Just let us know when your upgrade is complete and we'll update your account and send out the new solution to you.
As for the process and steps, you'd just do this:
1. Upgrade CRM 2011 to 2015
2. Alert us to the change in a support ticket
3. Recieve the updated CD import package and import it in with "Overwrite customizations" selected when prompted
4. Publish your customizations.
Let us know if that helps!