8.0 Windows Installer gotchas
from the Artful MySQL Tips List
Earlier versions The installer is easily confused by earlier MySQL versions, even earlier mysql*.msi installation files. Remove or hide these files before running the installer.
Existing data The installer is evidently incapable of upgrading existing MySQL data files from a 5.* installation or from a pre-release 8.0 installation. Run a complete mysqldump of current MySQL data excluding the mysql database, then remove or hide all existing MySQL data folders.
Restoring from the dump file If yourl dump of data from a previous MySQL version included the MySQL "privilege" database named mysql, remove this section of the dump file before restoring; failure to do so will wreck your MySQL 8.0 installation.
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