第一步下载idea
https://www.jetbrains.com/idea/download/#section=windows
第二步，到http://idea.lanyus.com/下载最新的jar包（要下载最新的，下载过几个之前的版本都不能用了，在这里下载的4.2）
把这个jar包放到IDEA的安装目录下，然后找到idea.exe.vmoptions和idea64.exe.vmoptions文件
在这两个文件的最后一行加上下面的这句话
-javaagent:加上你jar包的位置
注意：要修改JetbrainsCrack的路径。
修改Activation Code
重启Intellij IDEA，在Activation Code输入：
ThisCrackLicenseId-{
"licenseId":"ThisCrackLicenseId",
"licenseeName":"你想要的用户名",
"assigneeName":"",
"assigneeEmail":"随便填一个邮箱(我填的: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}
然后打开就可以用了，2100年够你用一辈子了，这个方法也可以破解其他JetBrains的软件，eg：pycharm