ProMusic27 - hi, I'm glad I went for the PSP pack myself.
Did you receive an e-mail from them after you completed the purchase? The email contains your codes, but has this as a starting point of where to go for the install process:
1. Start by visiting the PSP web site here:
https://www.pspaudioware.net/register/newaccount.php You will first need to open an account, if you don't have one yet.
2. Once logged into your account, please choose the option 'manual product activation' and use the activation code that comes with your product.
3. Once the activation process is completed, the product will be registered and visible on your account.