1. 下载语言包，61M   http://downloads.zend.com/studio-eclipse/6.0.1/ZendStudio6.0-Language-Pack-it.zip
2.解压到一个目录，如I:\Downloads\ZendStudio6.0-Language-Pack-it
3.打开eclipse，Help->Software Updates->Find and Install
4.在弹出的子窗体中选择Search for new features to install，Next

5.在Update sites to visit子窗体中，请勿勾选Sites to include in search中的默认项
点击New Location Site，选择I:\Downloads\ZendStudio6.0-Language-Pack-it，确定后会出现在Sites to include in search中，并且默认勾选，然后Finish

这时候更新管理器会自动查找。