1. Enter the MySQL official website address https://dev.mysql.com/ select download -> Community-> MySQL Community Server
Click MySQL Community Server
MySQL Community Server to enter this page, if you want to download 5.6 5.5 and other versions, click on this link
If you want to download the new version, scroll down. select Operating System Select Source Code
The following will be loaded into the appropriate download package, continue to pull down the page
Until you find (MySQL-5.7.21.tar.gz) this package in the last second resource page, click on the right side of the download page to download