Hi,
Blesta was installed via Installatron in my hosted cPanel account, nothing to do with Cloudflare (that I know of... never heard of Cloudflare until you posted it above).
My installed version of Blesta is "Version 4.3.2".
Normally, when there is an update available for any installatron/cPanel installed software there's an option to update it in cPanel. But it looks like 4.3.2 is the latest version available that route
Was there a known issue in older versions of Blesta where it was not possible to edit email templates? I've not had any trouble editing any other settings, including things like Signatures, default 'Index Page Content' etc. It's just the email templates.
Thanks