If your ZIP file contains vehicle blueprints rather than the full game, you must place them in your user profile folder for the game to recognize them:
Right-click the From.The.Depths.v3.5.9.4.zip file and select "Extract All..." or use a tool like WinRAR or 7-Zip to "Extract Here". File: From.The.Depths.v3.5.9.4.zip ...
Drag and drop the .blueprint files from your ZIP into this folder. 3. Mod Installation (Optional) If the ZIP contains game mods, follow these steps: Is there a way to Install blueprints manually in this game? If your ZIP file contains vehicle blueprints rather