Hi, thanks for you question.
The model you are interested in is (currently) only available for an old version (v1.6) of the kim-api software. To use it you would need to use an old version of lammps that works with that version of the kim-api. I’m afraid that it would take some effort to figure out exactly what version is necessary and to build all of the right components to get this working.
We have been working with the developer to get this model updated to support the latest version of the kim-api, but progress has been slow. We’ll take your interest as a good prompt to redouble our efforts.
Thanks for using OpenKIM!