dlc question

i bought the collectors edition and the conquest dlc. how do you know if the dlc downloaded correctly

Morning Beldive76, welcome to the forums.

I guess the only real way to test if the DLC downloaded correctly is to install it. (if the installation program does not run then it could be incomplete)
Once you have installed the expansion Packs you should have access to the new races in the selection screen.

Another way to check if the download was succesful and without errors is making a comparission of the size between your download and the download of another person OR asking to cliff what is the EXACT weight of the file.

I guess there’s a checksum the installer runs before it starts?