We have added Mac support to the plugin in version 1.02. However, there seems to be an issue running it from the engine folder, at least on our test machine (Apple silicon, unreal 4.26.2). A quick workaround: copy the PoseAI plugin folder from Engine/Plugins/Marketplace/ into /Plugins/, and then make sure to uninstall the plugin from the engine itself. We have asked Epic to investigate this oddity.
We have specified a Blueprint category for PoseAILiveLinkRetargetRotations as the lack prevented some packaging builds.