After nearly two years of development together with Search API Solr Search 8.x-1.x this is the first stable release of Search API Solr Multilingual Search. The minimum “still supported” Solr version is still 4.5.1. The latest available Solr version at the moment is 6.6.1 and is supported, too 🙂
The only way to install this module properly is the usage of composer!
To install the module including its dependencies simply change into your drupal directory and run
composer require drupal/search_api_solr_multilingual.
If you already installed 8.x-1.0-beta3 before simply change into your drupal directory and run
composer update drupal/search_api_solr_multilingual.
Still worth watching: