For documentation and requirements, go to https://www.easyredmine.com/redmine-plugin-generator.
- Download archive and extract to /your/path/to/redmine/plugins/
- If you downloaded the zip (https://github.com/easyredmine/redmine_entity_generator/archive/master.zip), rename the extracted directory to 'redmine_entity_generator'
- Restart Redmine
Login to Redmine and go to Administration -> Plugins. You should now see 'Redmine Entity Generator'.