First go to neovim release page and download the latest version (v0.5.0 or higher), then:
git clone https://github.com/siqiyan/vim-tmux-config.git ~/vim-tmux-config
cd vim-tmux-config/neovim
./install.sh
git clone https://github.com/siqiyan/vim-tmux-config.git ~/vim-tmux-config
cd vim-tmux-config
chmod u+x install.sh
./install.sh