I bought galaxy edition but can't find DLC's anywhere. What is happening?

are you using Galaxy 1, Galaxy 2, Paradox launcher or the off line installers?

if galaxxy 1 the Dlc are off by default and you have to turn them on... if Galaxy 2 the Dlc are hidden (along with everything else) and you have to dig down to find the settings
if you have the Paradox launcher then you are on your own but Paradox sometimes takes a few days to catch up

if you have the off line installer then you need to look on the browser side to find your keys