Download Apache Solr from https://lucene.apache.org/solr/ or try the nice installer packages from Bitnami at https://bitnami.com/stack/solr.
After you install the SolisSearch.{platform}.Web package you will find the schema.xml and solrconfig.xml needed to configure your Solr index to be compatible with the Solis Search framework. The schema file expects som text files for stopwords to exist in the index configuration folders. A default setup of those files should exist in the default configsets in your Apache Solr installation. Copy the files to the configuration folder of your index for Solis Search.