1、下载

打开 https://www.jetbrains.com/idea/download/other.html

2、配置安装

• 下载完成后加压缩，解压后文件目录如下：

解压完成后先不要着急运行。

首先我们修改一下IDEA的配置文件（以防覆盖了旧版本的IDEA，而且会导致一些奇怪的问题，比如可能选不了JDK等）。

打开如上bin目录下的 idea.properties 配置文件：

修改 idea.config.path 、idea.system.path、idea.plugins.path、idea.log.path三个地方。修改到指定位置下：

比如：

#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE config folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.config.path=E:/ideaIU-2020.3.win/summergao/config

#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE system folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.system.path=E:/ideaIU-2020.3.win/summergao/system

#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to user installed plugins folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.plugins.path=${idea.config.path}/plugins

#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE logs folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.log.path=${idea.system.path}/log

3、启动

双击bin目录下的 idea64.exe 运行

4、OK