That third-party product consists of a combination of a plugin
and a profile.
The profile would be what is showing that message.
If you don't want to use the third-party HCS Voice Packs product at all, you'd need to switch away from their profile (E.G. to the default example profile, or an empty new profile).
If you are experiencing issues with that third-party product, you'll want to contact HCS Voice Packs directly, via
their forum, or
their Discord