If you have received a code for a free font download, you can redeem it directly online. You will need to create an account before downloading the fonts.
1/ Go to http://www.tptq-arabic.com/my_account and register a new account (if you don't have one already).
2/ After successful registration, go to 'Corporate Fonts' https://www.tptq-arabic.com/my_account/corporate_fonts where you can enter your code.
3/ In the last step you will be prompted to agree with the End User Licence, so you can download the fonts.