In order to use the program to your new computer, you need to install it first. After you installed it, you need to activate it using the registration code that you received after purchasing it. This can usually be found on the mail address that you used for the purchasing. However, it seems that the official website of the developer is down / for sale. This could mean that the developer is out-of-service and there is no way to download the program anymore. If you don't have the installer package for the product, it seems that you won't be able to use it again.