OpenLink ODBC driver 8.0 fails to connect to the PostgreSQL on macOS

Are you saying can run queries with the iODBC Demo application against PostgreSQL 12.x but not PostgreSQL 15.x ? And if so does the iODBC Demo application at least connect to PostgreSQL 15.x or not ? If would be useful to see ODBC (iODBC and OpenLink) traces of the iODBC Demo connection/query attempts against PostgreSQL 15.x.