https://www.cnblogs.com/moko/p/5012006.html
1、把补丁下载到自己的电脑上
2、打开idea，help->edit custom VM options
在最后增加一行（具体为补丁的路径）
-javaagent:/Users/wangzhongqiu/work/tools/JetbrainsCrack-2.8.jar
3、断网重启
4、help->register->actiation code。输入如下内容
ThisCrackLicenseId-{
"licenseId":"ThisCrackLicenseId",
"licenseeName":"idea",
"assigneeName":"",
"assigneeEmail":"idea@163.com",
"licenseRestriction":"For This Crack, Only Test! Please support genuine!!!",
"checkConcurrentUse":false,
"products":[
{"code":"II","paidUpTo":"2099-12-31"},
{"code":"DM","paidUpTo":"2099-12-31"},
{"code":"AC","paidUpTo":"2099-12-31"},
{"code":"RS0","paidUpTo":"2099-12-31"},
{"code":"WS","paidUpTo":"2099-12-31"},
{"code":"DPN","paidUpTo":"2099-12-31"},
{"code":"RC","paidUpTo":"2099-12-31"},
{"code":"PS","paidUpTo":"2099-12-31"},
{"code":"DC","paidUpTo":"2099-12-31"},
{"code":"RM","paidUpTo":"2099-12-31"},
{"code":"CL","paidUpTo":"2099-12-31"},
{"code":"PC","paidUpTo":"2099-12-31"}
],
"hash":"2911276/0",
"gracePeriodDays":7,
"autoProlongated":false}
点击ok。
5、IntelliJ IDEA->about IntelliJ IDEA。查看过期时间，显示到2099年过期
6、恭喜你，破解成功。可以连上网继续写代码啦