Hi Marvey,
Yes, that should be possible - that one computer should be licensed and so be able to run as many instances of C4D as required (at least, I've heard of people running 2 instances of C4D, one acting as a master for Team Render to Picture Viewer but not contributing to the rendering, so it just acts as a controller and collector of the rendering but isn't burning up CPU power in rendering itself, with the other instance of C4D being used to keep working on a scene while that happens). Hope this helps!