Hi, mate,
So sorry I'm writing this
so late! Too long story...
Anyway, I'm pretty sure it's Ludwig Stark we're talking about here

I've already got his (L.Stark's) arr. of the second mov. of the Op.100 (or D.929), and yes, it definitely must be the Forberg edition (Klassischer Hausschatz, etc...) Now the thing is,
where do you think it might be?
I've tried other sites, even tried looking for it in other languages, Russian, German and French included, but no luck, and as for libraries...well, let's just say that after the shock I got when requestion Reinecke's scores of all Mozart's Piano Concertos in piano 2-hands arrangement from a German library which charged me the
tiny amount of nearly 200 euros for them, I've rather lost my enthusiasm about looking for scores in libraries, except the ones in my country, and I've had no luck whatsoever there, either
Cheers for the interest in my request!
Adolfo