I have followed the suggestion in this answer How do you update the default version of Nano on MacOS X without using the homebrew package manager?

I have macOS X Hight Sierra. After the installation I have tried:

$ nano -V

And the output is:

GNU nano version 2.0.6 (compiled 19:06:01, Oct  6 2017)
 Email: [email protected]    Web: http://www.nano-editor.org/
 Compiled options: --disable-nls --enable-color --enable-extra --enable-multibuffer --enable-nanorc --enable-utf8

So I have tried to see where nano is located:

$ which nano

and the output is

/usr/local/bin/nano

So checking the path

$ echo $PATH
/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin

And I don't understand why, if the first path is where nano is installed, the new version is not available.