Urgent Open MPI Installation Support

I'm urgently looking for someone who can help me with the installation of Open MPI on my macOS machine.

Key requirements:
- Advanced experience with Open MPI;
- Strong understanding of macOS system and software installations;
- Ability to communicate effectively and provide instructions in a clear manner.

Please note that I am a beginner in using Open MPI, so patience and the ability to explain complex technical issues in simple terms is essential.