Hi,
If you are already a Capture user, then there's isn't a separate demo - but that doesn't prevent you from importing DWG in your Basic Edition. What happens is that when you save the showfile, unlicensed elements of your design are excluded when saving, such as imported DWG objects.
So in short, you should be able to try importing DWG in your Basic Edition. When you say it didn't work at all, what happened?