Currently, there is not a 64-bit version of SQL Optimizer for SQL Server
Note:
When using Toad for SQL Server 6.8 64-bit (Xpert Edition or higher), SQL Optimizer for SQL Server (a 32-bit application) will not launch from within Toad. Integration is planned for the next release of Toad for SQL Server later this year. Please launch SQL Optimizer on its own, or install Toad for SQL Server 6.8 Universal Installer for the 32-bit version to use with SQL Optimizer for seamless integration.
