I had a bunch of the send line (0) failed things - tried the serial to USB - no luck.
I moved the files over to my old IBM 770 laptop and problem was solved!
Old meter - old computer - working good together for old installer.
My advice - get the crappiest old 'puter you can find and you are good to go.
Also your local specialty battery store can make a new battery pack that will be cheaper and better than the original.
JUst take in the whole unit so they can see exactly what it is.