I need to downgrade because I cannot use MySQL for Excel add-in. How can I do it? I use windows 8.
There is no information on the MySQL's website.
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To quote the Official MySQL Documentation
Downgrade from MySQL 8.0 to MySQL 5.7, or from a MySQL 8.0 release to a previous MySQL 8.0 release, is not supported. The only supported alternative is to restore a backup taken before upgrading. It is therefore imperative that you back up your data before starting the upgrade process
Install a fresh MySQL 8.0.28 version which can be downloaded from MySQL Product Archives
Backup existing database then restore it to the newly installed 8.0.28 version