步骤如下：
1.”Help” –>”Install New Software…”
2.安装过程中会产生如下错误：
Cannot complete the software install because one or more required items could not be found.
Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.14.1 (org.activiti.designer.feature.feature.group 5.14.1)
Missing requirement: Activiti Designer - GUI 5.14.1 (org.activiti.designer.gui 5.14.1) requires ‘bundle org.eclipse.emf 0.0.0’ but it could not be found
Cannot satisfy dependency:
From: Activiti Eclipse BPMN 2.0 Designer 5.14.1 (org.activiti.designer.feature.feature.group 5.14.1)
To: org.activiti.designer.gui [5.14.1]
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解决方案：
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（1）、升级最新的emf-validation-Update-1.8.0.zip插件包，下载地址：https://eclipse.org/modeling/emf/downloads/?project=transaction
离线安装：
离线安装时，提供的路径为https://www.activiti.org/designer/archived/activiti-designer-5.18.0.zip
（2）、将如下四个文件复制到Eclipse 的plugin目录下
com.ibm.icu_4.4.2.v20110823.jar
com.ibm.icu.source_4.4.2.v20110823.jar
com.ibm.icu.base_4.4.2.v20110831.jar
com.ibm.icu.base.source_4.4.2.v20110831.jar
重启Eclipse之后在线安装就没问题了
以上文件下载压缩包：http://download.csdn.net/detail/cwz825409741/8757231