How install Borderlands's DLC from GOTY on Steam?

Hi everybody !

I bought the game Borderlands GOTY ed. (CD). I want to activate it on Steam with the tool “Borderland Granting Tool”. But, when i want to use it, it’s impossible for me to install DLC from GOTY. The basic game is correctly installed. Not DLCs.

Help me please !

The DLCs should have keys of their own, and if so, you should be able to use the granting tool with those for the DLCs.