Have you tried www.sewusa.com ?

Does the machine on the web page link at the bottom of this post look like your Dressmaker?

They don't list a manual for the 960 in particular, but often the manufacturers would put out a manual for an entire line of machines (for example, the Dressmaker 900 series).

Here's a web page with links to all the Dressmaker manuals they sell:

http://www.sewusa.com/Sewing_Machine_Manuals/Dressmaker_Sewing_Machines.htm

HTH,
CMC

Here is a link that might be useful: Sew USA Dressmaker 900 manual