Unless you are maintaining a legacy project from 2013, or you have a very specific aesthetic craving for the "old noise," you should not install 1.49.02. Modern V-Ray (5/6/7) is faster, more stable, and infinitely more forgiving.
To avoid "mediocre" results, follow this preparation checklist before clicking render: Orient Your Model
The year was 2011. An aspiring architect sat in a dimly lit studio, staring at a SketchUp model of a minimalist glass villa. The deadline was 8:00 AM, and the model—while clean—looked like a flat cartoon.
