Hello, I am the Product Manager for the 3rd-party add-ons (Excel add-in, PowerPoint add-in, Google Sheets add-on). If you have questions about these, feel free to ask them here. All ideas for improvements can go in the Idea Exchange and you can add the link to your idea here for extra visibility.
I am looking forward to hearing from you!
Another useful link on the forum for the migration from Excel v2.6 to v3.2 onwards: https://community.anaplan.com/t5/Anaplan-Platform-Discussions/Migrate-Excel-Add-in-version-2-6-to-version-3-2/m-p/50790/thread-id/7480