Dear Andrew,
I don't know whether you still need the notes for the two piano
version of Op. 85, but I have it at home, and would be happy to make
you a copy and send it. Unfortunately, I bought this through an
antique book store, and don't know where else you could find it. It's
from Steingräber-Verlag in Leipzig, but I don't have the date (the old
publishings omit dates).
Best wishes,
Marianne