Did you purchase the Sapi 5 version or the NVDA addon?

Others may know better as I have no direct experience but I think there may be issues with associating the correct version of the addon version with the version of NVDA you are using.

That as I understand it  from other discussions the latest addon version is designed for NVDA 19.3  and not 19.2.

If you are still running 19.2  I think you may possibly need the previous addon version.

This is all a little confusing as, as far as I understand it 19.3 is still in beta and not officially released yet.

Personally I always use Sapi 5  versions and avoid using addon synthesisers to avoid these and other complications.

David Griffith