v1.1.8 Release has wrong version in module.json
The latest v1.1.8 release has v1.1.6 listed as the version in the module.json so will not install if you already have v1.1.7 installed.
The latest v1.1.8 release has v1.1.6 listed as the version in the module.json so will not install if you already have v1.1.7 installed.