在官网上下载好安装包安装好之后。
在网上搜索下载一个JetbrainsIdesCrack-4.2.jar。
复制到idea安装目录下的bin目录
然后修改idea.vmoptions和idea64.vmoptions这两个文件。
在后面添加（-javaagent：后面加上jar包的路径）：
-javaagent:/usr/local/Intellij/bin/JetbrainsIdesCrack-4.2.jar
然后启动idea，在激活码一栏输入：
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
windows版和linux版方法一样。
注：只适合idea2018版。