pglogical library

I would like to try pglogical to set up an archive server from a live database, filtering with INSERT, UPDATE statements (DELETE statements will not be replicated in the archive server). I follow the official documentation but when i set shared_preload_libraries = 'pglogical' in my configuration file (postgresql.conf) the server could not start. There is no pglogical file in ./usr/pgsql-9.6/lib/ directory. How setting up all prerequisites to start properly (with v9.5 and 9.6)? I am using PostgreSQL v9.5 and v9.6 for POC on CentOS 7. Many Thanks.