Error message "The database you're trying to open does not look like a modeler database. it lacks the essentail table _MetaDta or the table is of the wrong format"
Are you sure you are opening a Modeler database and not a data database? Try and open the database with a tool such as PgAdmin or SqlServer Management Studio. If it is a Modeler database it should contain the table _MetaData and many model-related tables like FbTemplateGrid.