Installation
Here is a useful official information.
You can use the shell script FeynInstall to install all necessary public codes.
It is expected that you should just hit yes for all the questions, but it somehow failed in my case to set the suitable $PATH environment.
Thus, I manually set it by adding the following sentence in ~/Library/Mathemtica/Kernel/init.m:
$Path = Join[{ToFileName[$HomeDirectory, "FeynArts"],
ToFileName[$HomeDirectory, "FormCalc"]}, $Path]Note that the above example corresponds to the case when FeynInstall is executed in the home directory.