I'm having difficulties installing Apache Solr. The latest version that I downloaded was 4.6.0. But all Drupal documentation and tutorials (see http://www.youtube.com/watch?v=ori-VvvH1Aw) are talking about 3.5.0. While 3.5.0 is nowhere to be found on internet, 4.6.0 has a totally different directory structure, and there is no documentation on how to install this latest version on a server or on a local WAMP. There is no mentioning of which Apache Solr versions are most recommended to work with Drupal? Any help?