The Animancer v7.0 Change log is the longest of any version yet. See the Animancer v6.0 Upgrade Guide if you are upgrading from an older version.

When upgrading to a newer version of Animancer, you must delete any previous version from your project first.

This version brings some major changes which require manual fixes if you are upgrading an existing project from an earlier version of Animancer so you might want to avoid upgrading until you start a new project.

• Support for Unity 2018.4 has been dropped. The minimum supported version is now 2019.4 (though it might still work on earlier 2019 versions).
• All Transition Scripts have been moved and renamed (see the Renaming table).
• Transition Assets now use [SerializeReference] fields. Unfortunately, this means that all Transition Assets will lose their data when upgrading from an earlier version of Animancer. Step #6 of the Upgrade Process explains how you can prevent this by editing the assets manually with a text editor.