Hi Fernando,
JDBC Driver can be downloaded from here:
If you plan to use WmJDBCAdapter, check if this driver supports DataSource class implementation, otherwise you will have to use the WmDB package.
See also:
Getting the JDBC URL - Amazon Redshift (plus following chapter).
As long as Redshift is not mentiioned in the webMethods Adapters SystemRequirements Guide it is not officially supported by the JDBC Adapter.
It might work, but it is not sure.
Regards,
Holger