21.3버전을 사용했다. 1. 컴파일러 다운로드https://github.com/protocolbuffers/protobuf/releases?q=visual+studio&expanded=true Releases · protocolbuffers/protobufProtocol Buffers - Google's data interchange format - protocolbuffers/protobufgithub.com 2. 라이브러리 다운로드dll파일 4개 다운로드한다.https://www.nuget.org/packages/Google.Protobuf/3.21.3#supportedframeworks-body-tabhttps://www.nuget.org/packages/System.Memory/#support..