Export to Harmony.zxp Not Working

Context: I am trying to export my .fla file into Toon Boom.

Problem: I am unable to install the Export to Harmony.zxp extension that would allow me to do this. I get the message “The extension can not be installed, it requires Flash version 11 or greater” in Adobe Extension Manager.

Background: I am using Toon Boom Harmony 15.0 Advanced, Adobe Animate CC 2019, Adobe Flash Player - Version: and Windows 10 Home.

Does anyone know how to fix this or if there is another way to export the whole .fla file into Toon Boom?