Hi, you are lucky getting two Sothink products from different ways, here are two ways to keep both of them.
1, Install the two packages, activate the version you downloaded form sharewareonsale, then you can use bluray creator with the key also from Sharewareonsale.
When you want to use bluray copy, then open bluray copy package you downloaded form SothinkMedia website, which is pre-activated. If feel troublesome, choose option 2.
2, Just keep the package you got from SothinkMedia site. You can activate bluray creator product with the key you got from Sharewareonsale.
Then you will use only one installation, with bluray copy(pre-activated) and bluray creator (key from sharewareonsale).