So back to doublecad.com to ask for the number. It's not free.
Downloaded DoubleCAD XT. Last step requires customer information, which asks for serial #. The user agreement says it is provided with the software, but I can't find it.
Top 3 news reading apps
With the latest tech, getting news delivered to your phone is easier than ever. Here's a roundup of apps that are customizable and useful for getting the news.