If you don't want an older version from your distro, it's easy to use the appImage.

    cd ~
    wget --quiet https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage --output-document nvim
    chmod +x nvim
    sudo chown root:root nvim
    sudo mv nvim /usr/bin
    mkdir -p .config/nvim

To uninstall, one would delete the binary, and .config/nvim + any other folders specified in your plugin manager.