I won't bother downloading a demo that's considerably older than the final release, what good could it do to me to convince me to buy a product if the demo of it is filled with bugs and instability issues that have supposedly been fixed in the final product? No good. If they want to convince me they should take whatever portion of the final release and put that as a demo, not something buggy out of an older build/code.
At worst they should have released the demo on day one of the final release, or a week later, not before it (unless the version of the demo would be the same as the final one, which isn't the case right now, so in my opinion it's a mishap from BioWare). I was planning on buying the game anyway, however. I will skip this demo and I'll wait about two or three months to buy it when its price will inevitably be lowered.