IntelliJ ideaIC/ideaIU下载：
https://www.jetbrains.com/idea/download/
https://www.jetbrains.com/idea/download/previous.html
ideaIC是社区版，有着基本的开发功能，有Java开发功能但是没有JavaWeb开发功能；要找JavaWeb插件来安装，或使用tomcat-maven-plugin来“曲线编程”；
ideaIU是旗舰版，有很多完善的功能，直接集成了JavaWeb开发功能。
我下载的是ideaIU-2016.3.8.win：https://download.jetbrains.com/idea/ideaIU-2016.3.8.win.zip，然后解压到ideaIU-2016.3.8.win文件夹，打开此文件夹可看到bin、lib、plugins等IntelliJ ideaIU的文件夹；这个ideaIU-2016.3.8.win文件夹的全路径地址就是ideaIU的安装路径（下文用%ideaIU_HOME%代替）。
ideaIU-2016.3.8.win的破解激活步骤：
下载破解补丁：JetbrainsCrack-2.7-release-str.jar；
把破解补丁粘帖到%ideaIU_HOME%\bin；
用记事本打开%ideaIU_HOME%\bin的idea.exe.vmoptions和idea64.exe.vmoptions这两个文件，最后一行增加如下代码：-javaagent:%ideaIU_HOME%\bin\JetbrainsCrack-2.7-release-str.jar（注意：-javaagent的值为破解补丁在ideaIU安装路径下的全路径地址，请自行修改！）；
将“0.0.0.0 account.jetbrains.com”添加到hosts；
启动ideaIU，选择Activation Code，输入有效期到2099年的激活码（见文末）或步骤3所新增的那一行代码或任意文字。
BIG3CLIK6F-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-iygsIMXTVeSyYkUxAqpHmymrgwN5InkOfeRhhPIPa88FO9FRuZosIBTY18tflChACznk3qferT7iMGKm7pumDTR4FbVVlK/3n1ER0eMKu2NcaXb7m10xT6kLW1Xb3LtuZEnuis5pYuEwT1zR7GskeNWdYZ0dAJpNDLFrqPyAPo5s1KLDHKpw+VfVd4uf7RMjOIzuJhAAYAG+amyivQt61I9aYiwpHQvUphvTwi0X0qL/oDJHAQbIv4Qwscyo4aYZJBKutYioZH9rgOP6Yw/sCltpoPWlJtDOcw/iEWYiCVG1pH9AWjCYXZ9AbbEBOWV71IQr5VWrsqFZ7cg7hLEJ3A==-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
以上过程激活步骤，我是在IntelliJ ideaIU-2016.3.8.win上操作的。操作成功后，可在IDEA菜单栏->Help->About查看：