Register your X-Cart as follows:
- Make sure that no HTTP-authorization and firewall restrictions are set on incoming HTTP-connections to your X-Cart installation.
- Login to your private members area with your username and password.
- Go to "My licenses" section.
- Check whether the license URL is the URL to the home directory of your X-Cart store (without a trailing slash). If it is not, follow the "Change URL" link to the right from the license URL and replace the license URL with the correct one.
- Follow "Register" link to the right from the license URL
Also, you can find more detailed instructions with the correct license URL in your X-Cart backend. The instructions are a part of the evaluation notice shown in the X-Cart backend.