Can you put all of the files into ONE folder.
Right click on the one folder and select Send to Compressed (zipped) Folder.
Attach the ONE resulting *.zip file?
The full add-in of SOLIDWORKS Simulation should be able to analyze your assembly. Are you trying to use SimulationXpress? If you are you may find that you are unable to create the necessary fixtures to get good results from the program as you are limited to using only "Fixed" type fixtures where portions of your model will require less rigid constraints.