Will there be a update for Ubuntu Software Center or Ubuntu's Update Manager?

I don't manage the update for Ubuntu Software Center myself. Please contact them and see how an update works. If you find information, don't hesitate to share it here.

I have several people using the program; [...]

This is too vague to guess what is your issue here. Are you a teacher with students? Are you a manager with designers?
Wouldn't the new portable version of Sweet Home 3D more efficient in your case?