A quick Google search will present dozens of websites offering a free download of "Buddha.dll" (e.g., DLL-files.com, Fix4Dll, etc.).
The most effective way to resolve this without downloading potentially dangerous files from unknown websites is to recover it from your own system: Check Antivirus Quarantine : Open your antivirus or Windows Defender Protection History . If you find the file there, you can "Restore" it. Add an Exclusion Download Buddha.dll Black Ops 2
However, using clients like Plutonium to play on private, community-run servers is generally tolerated for preserving older games, provided you own a legitimate copy of BO2. Always read the community’s rules before playing. A quick Google search will present dozens of
Stay safe, and enjoy Black Ops 2 the right way. Add an Exclusion However, using clients like Plutonium
Are you using a like Plutonium, or are you trying to fix a standard Steam installation ?