Can’t install addon

The most recent version of Jarvis is installed on a W7-64.

The problem is,
1. it downloads stalker plus from repository but won’t install – so stalker plus is not installed.

2. using stalker addon that was part of the Kodi, it is installed and configured, but it will not ‘run’

It is possible these are connected. but neither works.

Any thoughts on this? file permissions? Conflicts?