If you have lost your activation key, log into your www.getdata.com customer account here: https://support.getdata.com/my/ (or using the 'Member Login' link in the footer of any GetData web site such as www.getdata.com.com) where you can locate a record of your purchase, including your activation details.
Login: [the email address used in your purchase]
Password: [if you do not know your password, use the "send me my password" link]