2)安装过程中错误处理
a、错误：
Cannot complete the 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 Eclipse BPMN 2.0 Designer 5.14.1 (org.activiti.designer.feature.feature.group 5.14.1) requires 'org.eclipse.emf.transaction 1.4.0' but it could not be found
b、解决办法
但具体到本机环境有所不同，具体如下，以下是本机解决方案，如下：
org.eclipse.emf.validation.ui_1.7.0.201403111711.jar、
org.eclipse.emf.workspace_1.5.1.201306111400.jar、
org.eclipse.emf.validation_1.8.0.201403111711.jar
org.eclipse.emf.transaction_1.4.0.201306111400.jar；
四个插件下载地址：http://download.csdn.net/detail/yixiaoping/8520517
把这四个文件拷贝到自己的eclipse的plugin文件夹下面，重启eclipse再次安装activiti插件就可以了。