: Security software often flags files in "All DLC" packs (specifically the steam_api64.dll ) as false positives. If the game won't open, check your antivirus quarantine and add the game folder to your exclusions list .
Install and Visual C++ Redistributables (x64 and x86) to ensure the game engine runs without "Missing DLL" errors. Launch the Game : File: Depth.v36111.Incl.ALL.DLC.zip ...
If items are missing, check for a steam_emu.ini or similar configuration file in the game folder. Ensure the "DLC" section lists the IDs for the expansions. Troubleshooting Common Issues : Security software often flags files in "All