Purchase the soundtrack for Sins of a Solar Empire: Rebellion containing over 2 hours of high-fidelity music across 55 individual tracks! This soundtrack DLC contains both FLAC and MP3 formats converted from the original production .wav files.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam