I have tried using CosmosMotion several times and everytime I need to get a real answer, I am told by the tech support folks that there is a bug. I believe that CosmosMotion is not ready for real solution of assemblies..It is just a freebie that Solidworks throws in with their software.
I too have been looking for something to help me though the process. It’s not a freebie, it’s part of the Premium package, and should have a good tutorial and help files.