I think I know the answer to this, but was just checking.
The other day in Vegas 14 I tried re-rendering at 1080p video to 720p, but halfway through the operation shut down with an Unmanaged Exception error. It generated a report, which I sent, but then I thought, is Magix even updating Vegas 14 any more? Are the error reports like throwing messages in bottles into the ocean?
Then I took the same video file and re-rendered in Vegas 15, and no errors at all. I should mention the video also rendered a lot faster than it was rendering in 14, that is, 30 mins versus 90 mins.
This just started me thinking that this is one way to keep you with most current version of the software if it is the only one being updated and fixed.