the developers promised the epilogue to all owners of the COMPLETE collection. However they created two different variants of it, one that you get when you buy the game directly through Steam (https://steamdb.info/sub/72148/apps/) and another one if you buy it somewhere else (https://steamdb.info/sub/77613/apps/).
Unfortunately the developers have forgotten to add the epilogue (and wallpaper and what else there is) to be added to the Retail COMPLETE collection.
Please FIX this, thank you.
Activision Publishing, Inc.