Installing Zerba GC420d thermal label printer on Windows 7

See the PDF documention that came with the printer, now in the google cloud.

After installing the printer it only printed a single line at the top of the label.  And the label that showed in the design window had a red box at the top.  To resolve this i called support and was instructed to do the following …
In the Printer Setup menu select the Paper Size user defined and specify 4 x 6 and click ok.  Save that label.   That fixed the proglem null

re drivers (EPL OR NOT) check out: ← but apparently both drivers should work.