Install FeynCalc

Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"];

InstallFeynCalc[InstallFeynCalcDevelopmentVersion->True]

Install FeynHelpers

Import["https://raw.githubusercontent.com/FeynCalc/feynhelpers/master/install.m"]

InstallFeynHelpers[InstallFeynHelpersDevelopmentVersion->True]

Install FeynOnium

Import["https://raw.githubusercontent.com/FeynCalc/feynonium/master/install.m"]

InstallFeynOnium[InstallFeynOniumDevelopmentVersion->True]