Activity--Eclipse安装Activity designer插件失败

案例

今天使用Eclipse 安装Activity designer插件时，出现了如下错误：

An error occurred while collecting items to be installed
session context was:(profile=D__Program Files_Ecplise_eclipse, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to connect to repository http://activiti.org/designer/update/plugins/org.eclipse.graphiti.mm_0.11.4.v20150701-1432.jar
Connection timed out: connect

解决方案

重新打开Help->Install New Software，然后断开网络再离线安装一遍