The connection between the forum and the tool is symbiotic.
download the DLC files itself. If a game's DLC content is not included in the base game's download (as is common with large expansions), users must manually find and place those files in the game folder for the unlocker to work. Installation Process
Pair CreamAPI with if the game needs full offline emulation. CreamAPI alone only unlocks DLCs when Steam is running (even in offline mode).
Here’s a concise, informative breakdown.