As explained in the plugin description and documentation (and also in the name of the plugin), the plugin works exclusively with the Retargeting system of Unreal Engine. It doesn’t support substituting the skeletons assets.
We launched an official Discord server dedicated to our plugins. If you’re using the Mixamo Animation Retargeting plugin, join the server to be informed of updates and special offers (and to keep in touch with us ):
Discord server: https://discord.gg/PuAyhDctHp
As part of the UE Marketplace Black Friday, some of our plugins are 30% OFF now through December 3:
MIXAMO ANIMATION RETARGETING
GOOGLE ANALYTICS MEASUREMENT PROTOCOL
Remember to join our Discord server for other news: https://discord.gg/PuAyhDctHp