下载mysql的压缩包

将mysql的压缩包解压到你的laragon中 /bin/mysql/ 文件夹中

初始化数据

How to add old version of MySQL for your case: (http://ftp.iij.ad.jp/pub/db/mysql/Downloads/MySQL-5.1/mysql-noinstall-5.1.73-win32.zip)
1、Backup your databases using mysqldump
2、Rename current data dir to data-backup
3、Copy your data dir in bin/mysql/mysql-noinstall-5.1.73-win32 to the former data dir place
4、Start Laragon and restore former databases from the dump file

将laragon/data/mysql/mysql 文件夹备份，
将新mysql 压缩包中的data数据拷贝到laragon/data/mysql/mysql，然后重启mysql就可以实现切换。。

切换PHP版本和APACHE版本

切换PHP和Apache都更加容易，只要到官网下载对应的PHP Apache版本的压缩包，然后解压放到laragon下面对应的php和apache文件夹中