MySQL Community Server （存档版本）：
https://downloads.mysql.com/archives/community/
https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.26-win32.zip
想下载其他版本，把版本号该过去就可以了，比如
mysql-5.7.28 32位：
https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.28-win32.zip
mysql-5.7.28 64位：
https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.28-winx64.zip