Download plug.vim and put it in the "autoload" directory.
curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
You can automate the process by putting the command in your Vim configuration file as suggested here.
iwr -useb https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim |`
ni $HOME/vimfiles/autoload/plug.vim -Force
sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs \
https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
curl -fLo ~/.var/app/io.neovim.nvim/data/nvim/site/autoload/plug.vim --create-dirs \
https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
iwr -useb https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim |`
ni "$(@($env:XDG_DATA_HOME, $env:LOCALAPPDATA)[$null -eq $env:XDG_DATA_HOME])/nvim-data/site/autoload/plug.vim" -Force
git clone https://github.com/GR3YH4TT3R93/OurNvim.git ~/.config/nvim