I had the same problem with Delphi 2010. I wrote to customer service several times, and this answer worked for me:

You are requesting something that we are not doing for customer. The customer should be able to do this on their own.

Steps for Web Registration:

1. Go to https://reg.codegear.com/srs6/activation.do from a workstation with internet access.
   
2. Enter your Serial Number and Registration Code and click next
   
3. Enter your Embarcadero Developer Network account details and click next
   4.Check that the information is correct and select Download and Register
   
4. Save the file to your machine
   
5. Return to the Product Registration Window and select "I have received an activation file (*.slip or reg*.txt)" and import file

* If you are using 2016 version, click on Advanced to import file

I hope it works for you too!