Once you have MySQL 5.5 running, you will likely need to restore an old database backup:
You can find older versions, including 5.5, on the MySQL Product Archives page. download mysql server 5.5
MySQL Server 5.5 was a monumental release that fundamentally changed the database's DNA. While it is now an archived version, it remains a critical piece of tech history and a necessary tool for maintaining legacy environments. Why MySQL 5.5 Mattered Once you have MySQL 5