I can't check trinity, but those of us that bought each version separately, the store it says to register on impulse and download with that. See below.

|
Product: |
Sins of a Solar Empire (Download + Retail Box) |
Serial: |
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
|
Downloads: |
Please use Impulse to register your serial number and download this software. |
|
 |
Product: |
Sins of a Solar Empire - Diplomacy |
Serial: |
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
|
Downloads: |
Please use Impulse to register your serial number and download this software. |
|
 |
Product: |
Sins of a Solar Empire: Entrenchment |
Serial: |
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
|
Downloads: |
Please use Impulse to register your serial number and download this software. |
|
I know I purchased well before the sale of Impulse to GameStop, so I have to assume that even those that purchased Trinity would be given the same message... Unless you guys are playing favorites with the Trinity owners. 