There's nothing more infurating than getting your sewing machine out after you haven't used it for a while, and then not being able to find the user manual - especially when you own a machine as complex as the fabulous Husqvarna computerized models!
You don't say which of the two models you have, of those pictured below, so I'll try to make my answer helpful to both.
1. The Husqvarna Viking Huskystar C10
2. The Husqvarna Viking Huskystar C20
I think I've managed to find a downloadable PDF version of the combined manual for the Husqvarna Huskystars C10 and C20 here.
There are also separate versions, for each of the two models, available via Manuals Online: