This is definitely a duplicate of FeynArts not working properly. However, that post dates back 5 years. I am currently on Mathematica 126.96.36.199 with Windows 10 as my OS. I have been trying to load the FeynArts package but to no avail.
I have followed the route of automatic installation prescribed in the FeynCalc wiki(includes an option to install patched version of FeynArts 3.9):
1. Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"] 2. InstallFeynCalc
Despite an apparent clean installation, FeynArts doesn't seem to be loaded.
$LoadFeynArts = True; <<FeynCalc`;
which returned the output:
FeynCalc is already loaded! To reload it, please restart the kernel.
Now, when I tried the simplest piece of code one can have via this package:
it just returns the input back!
How to get this package(FeynArts) working side by side with FeynCalc?