问题：
之前装的IDEA 2019.1.1版本，然后修改了idea.vmoptions，添加了jetbrains-agent.jar，后来更新卸载了2019.1.1版本，安装新版本2020.1，启动一直闪退，启动不了，查询了很多解决方法，好像都不适合么有解决，后面结合大神给的方法,查到自己的问题。
解决办法：
1）先查看日志提示：
- 应用程序--找到idea--右击显示包内容--Contents--MacOS--打开idea
2020-12-26 12:06:40.275 idea[2687:95642] allVms required 1.8*,1.8+
2020-12-26 12:06:40.277 idea[2687:95646] Current Directory: /Users/ethan
2020-12-26 12:06:40.277 idea[2687:95646] Value of IDEA_VM_OPTIONS is (null)
2020-12-26 12:06:40.277 idea[2687:95646] Processing VMOptions file at /Users/****/Library/Application Support/JetBrains/IntelliJIdea2020.1/idea.vmoptions
2020-12-26 12:06:40.278 idea[2687:95646] Done
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Error opening zip file or JAR manifest missing : /Applications/IntelliJ\ IDEA.app/Contents/bin/jetbrains-agent.jar
Error occurred during initialization of VM
agent library failed to init: instrument
logout
加黑部分提示是：jetbrains-agent.jar的问题，之前确实修改了idea.vmoptions加上了，导致现在无法启动。如下图
- 解决
- 打开终端--进入/Users/ethan/Library/Application Support/JetBrains/IntelliJIdea(对应版本）--vim idea.vmoptions--删除之前配置的Javaagent行--wq
- 重启启动
