Digital BW, The Print

I am still unsuccessfully striving to get QTR working.
I'm on a G4 running 10.2, with a USB-connected Epson 2200.
Also, I am running PS6 under Classic.

When I select "Print" under PS6, I still just see the same old
Epson driver.

Is there an easy to way to check, maybe in a Unix terminal shell,
that all the things are installed: gimp-print, ghostscript, qtr,
etc.  I believe I have properly done the "Add" procedure and then
installed some of the curves as explained the last time I begged
for help.  I am at wit's end.

Thanks, John