You will receive the error message "File 44 - Close all IRRICAD designs before loading or unloading the application" when double-clicking on a DWG file to open the design and launch IRRICAD Link. This is due to AutoCAD and BricsCAD loading the arx / brx plugin only after a drawing is open in the program.
However, if AutoCAD or BricsCAD is already open with a drawing, even the default "Drawing 1", then double-clicking on a DWG file will open the required drawing in the already open program.
If you are receiving this message but have not double-clicked on a DWG file see our forum post "Error Message: close all IRRICAD designs before loading or unloading the application" (viewtopic.php?t=854) .
The IRRICAD Team