In order to install nvim configuration use the latest version of nvim:

curl -LO https://github.com/neovim/neovim/releases/latest/download/nvim.appimage
chmod u+x nvim.appimage
./nvim.appimage

# Rename and add to PATH as necessary"

Ensure that the correct nvim is being referenced via which nvim. Shout out the necessary files and use PackerSync while within the packer.lua file