FIP Setup
To installation of any FIP module is very simple, both on Linux and on Windows. First of all, you will need to grab your binary, like fip-c (or fip-c.exe) from the Releases page of the fip repository. When executing flintc --version you should see the Flint Interop Protocol version printed in there. You need to grab the Interop Modules of that version.
Linux
Once you have downloaded the fip-c binary you need to put it into the $HOME/.local/fip/modules directory and with that the setup is complete. The binary needs to be present in that directory, you cannot put it anywhere else.
Windows
Once you downloaded the fip-c.exe executable you can simply put it into the %LOCALAPPDATA%/fip/modules directory. Once you have done that, the setup of the fip-c Interop Module (or any FIP IM) is complete.