Hello!
Thanks for your interest in EDAP Tools!
As far as we know, this is an Animate 24.0.15 issue with plugin tools, affecting only some users.
Going down to Animate 24.0.14 or 24.0.13 should sort it out.
Here is our Known Issues entry for this bug:
https://flash-powertools.com/known-issues/#missing-kineflex-and-freestyle-rigging
When we find out more we will update the entry.
Good luck with your projects!