Plugin LensTagger

I am hoping that someone can point me in the right direction.

In addition to 6-bit coded Leica lenses which provide relevant EXIF info, e,g, focal length, lens name, etc, I am also using  Voigtlander lenses which are not Leica 6-bit coded.

In order to have EXIF info recorded from Voigtlander lenses when using LR6, I added the LensTagger plugin (plus exiftool).

In my repeated attempts to use it, I have been getting the error message: Failed to run command.

I am hoping someone who had overcome a similar problem can show me the way to resolve this.

Thank you in anticipation of a solution.