官方網是這樣說的：
https://www.activiti.org/userguide/index.html#springSpringBoot

The following installation instructions are verified on Eclipse Kepler and Indigo. Note that Eclipse Helios is NOT supported.

Go to Help → Install New Software. In the following panel, click on Add button and fill in the following fields:

*Name:*Activiti BPMN 2.0 designer

*Location:*http://activiti.org/designer/update/
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這樣安裝，由於網絡原因會經常卡死：

第二種解決方案，手動安裝離線文件：
Eclipse版本：
我本人實驗，驗證過的：
Mac版：eclipse-jee-indigo-SR2-macosx-cocoa-x86_64
Mac版：eclipse-jee-neon-3-macosx-cocoa-x86_64
eclipse老版本indigo-3.7和最新版本neon-4.6，版本解釋見下方：
http://blog.csdn.net/shenhonglei1234/article/details/55097889

安裝步驟一：
百度雲：
鏈接:https://pan.baidu.com/s/1uVbckVTD_puqf0G7x5PXpg 密碼:2rbm

安裝步驟二：

將下載的文件解壓放到：

notes:
將activiti-designer-5.14.1內的兩個文件：features和plugins放到eclipse的dropins文件內：如圖：

將文件：eclipse安裝activiti需裝eclipse插件20170325的四個文件放到eclipse根目錄的plugins內：
org.eclipse.emf.transaction_1.4.0.201306111400
org.eclipse.emf.validation_1.8.0.201403111711
org.eclipse.emf.validation.ui_1.7.0.201403111711
org.eclipse.emf.workspace_1.5.1.201306111400

為什麽放：在線安裝時會報：
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
缺失插件。

安裝步驟三：
上面步驟OK後，重新啟動eclipse就OK了，成功後的效果：

如果你不安裝缺失的四個插件，視圖裏不會顯示Activiti文件夾，也就是說安裝不成功。

Activiti BPMN 2.0 designer eclipse插件安裝