David, I have another option for you: I use Kerkythea for my renderings. They are nowhere near as nice as the ones that you create, but Kerkythea can be very easy to use. There is a free version that was out in 2008 that is still available on sites. They have a high-end renderer called Thea Render that is the fully developed version of Kerkythea. I bought it and tried to learn it, but the learning curve was too much for my 70+ brain, so I've stayed with Kerkythea for renders and animations. You can stay with v22 of DataCAD and then export your 3d model as a 3ds file, then import it into Kerkythea and render.
I have a very simple cheat sheet that lists about 6 steps to make it work, so it's not quite as fast as using o2c, but I can't use it for simple renders most of the time. There is some issue with certain planes that makes them shade with a dark diagonal band across the surface when I generate shadows. It confuses the client when they can't visualize a flat surface there.
I can give you the link for Kerkythea and my cheat sheet; I'd even be willing to do a video call and walk you through it; easy peasy.
Best thing is, Kerkythea replicates DataCAD's colors very well, so if you've developed your model with representative colors, they will appear nicely in K. However, if you use a color, say dark gray, for paving on one layer, and dark gray for shingles on another layer, they all import as one dark gray object. All imports are grouped only be color upon import. Layers don't make any difference. I make sure to separate my building elements by color; FYI, colors are easily manipulated in K.; you can even add seamless textures, but again, if you change the dark gray to a shingle image, the driveway changes also. The very easy work-around is to export the gray shingle in one operation, than add a new 3ds file with your gray paving later. Doing it this way creates 2 different objects of the same color that can be treated differently. Not a big problem.
Essentially, you export your 3d model as a .3ds file ( 5 seconds max), open Kerkythea, import the .3ds model (nothing appears until you zoom in/out, then the edge lines of every triangle appear (they don't render as lines across a plane). Then zoom out a ways overhead, add a light (5 more seconds) and hit the quick render (5 seconds max). Pretty quick when you think about it. The image is way better than o2c. You can add any number of several kinds of lights, have none, one, or any create shadows, insert a camera at a nice viewpoint so you can replicate the view again later, or add several cameras and create images for a flyby. I use other software to stitch those images into a fly-around.
I'll send you and example on FaceBook.