Instructions on how to use the tool can be found here

In January 2025, Macmillan and Blackboard released a content migration tool. This tool was built by Blackboard in coordination with Macmillan.

The purpose was to provide a way for admins to bulk migrate courses using legacy Macmillan integration options (e.g. Partner Cloud) to the new LTI Advantage integration.
Now that legacy integrations have been fully deactivated, we’re announcing that Macmillan migration tool will be made inactive permanently on June 30, 2026
We highly recommend using the tool to transition content from legacy sources, Macmillan Partner Cloud integration, before that date to avoid the multi-step effort required to manually delete assignment links and gradebook columns before deploying assignment links via LTI Advantage and reorganizing them.