Sorry to have taken so long to reply. I have been preparing annual accounts for the society of which I am treasurer. The last thing I wanted was to have my printer down should anything have gone pear shaped.
I downloaded and installed the file and can now access the printer services part of the toolbox. Printer status and information, however, still don't work due to lack of bi-directional communication. However, as far as I am concerned, the important part of the toolbox now works and, yes, the problem is now sorted.
You could try re-seating the cables (printer <-> computer) or trying another cable if you can get hold of one. Also, there may be something in your printer software to enable/disable bidirectional whatevers. I remember an HP printer I had a long time ago wher there was something like that but I can't remember any detail.