I registered twice, to try and get a free key sent for the wpf grid. It was never received. I received a welcome to the trial edition however.

It should be received within a few minutes.

Just to make sure we are on the same page, you need to be logged in (on Xceed web site), on the DataGrid for WPF product page, press the "> REGISTER (Express Ed.)" button.  You should be brought to a page that says :

Xceed DataGrid for WPF Express Edition Free registration / Free upgrade

Thank you <your name>, you have successfully been registered ... 

If this is what you do, and still don't receive a license key, please send an email to sales explaining your situation, and they will send one to you.