Postage Calculator

help please....

I have been using the free version just to test it. Have been very happy, and now want to build. I went in to change the shipping method in Store Settings to calculated, but it came up with the link saying "Upgrade to use this option". I followed the link, Paid for the monthly subscription, downloaded the file, uploaded the file...... All said and done, I now have the WPMU DEV dashboard, and it say's that it is installed and active.

So, I went back into store settings now that I have upgraded, and clicked on calculated shipping, and ........ We are right back to the start. It still has the "Upgrade Link" in red there, and will not let me choose it.

HOW DO I GET THIS TO WORK?

Please help me. Thanks, Daniel