I can't run those scripts. My site runs on shared hosting, I don't have command line access. All I have is a file manager for my 'htdocs' and standard cpanel stuff.
I'd argue that among people who know about Let's Encrypt, VPS hosting is more popular than cPanel-style shared hosting.
It looks like current versions of CPanel now have native support for Let's Encrypt: https://features.cpanel.net/topic/provide-support-for-lets-e...
I'd wait for your host to update its cPanel (unless you absolutely need https, then I'd either change hosts or buy a certificate elsewhere).