You can check if that process went through correctly to create your license or not, by going to your accounts page.
1) Log into your MathWorks account here and then click on the down arrow right next to your name.
2) Select My account.
3) If everything went well, you will see License # and Label "MathWorks Arduino Kit".
4) If Step 3 is successful, you can click on your license # and the new page that opens up will give you link to download products.
5) Then you can download, install and activate the products.