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Your antivirus likely ate the file. Go to Windows Security > Virus & threat protection > Protection history. Look for a threat named "HackTool:Win64/Plutonium" or similar. Click "Restore" and then add an exclusion.

Ensure your and Visual C++ Redistributables are up to date, as these are often the actual cause of launch failures mistaken for DLL errors. Consider Official Alternatives: Download Buddha.dll Black Ops 2