[PyMOL] MacOS install

Hi!
I'm having problems installing compiling and installing the open source version of pymol on MacOS High Sierra; specifically I need the 1.8.4 or 1.8.6. I don't have much experience compiling and installing it and I haven't found clear instructions on how to install previous versions of pymol on Mac.

Hope someone can give me some guidance.
Best regards
E. Ordaz