No option to choose "classic editor" or "block" editor in Theme Options

Hi there

Im having an issue with one of my sites, the plugins Yoast and Classic Editor are conflicting. The only option I have is to turn one of them off, which ideally would be classic editor. Normally we would select “Classic WP Editor” in Theme Options so we do not have to use the classic editor plugin, however I do not have this option (I have the option with all my other websites, it is just this one) – I recently updated the theme and all plugins, the theme is now at version 4.4.1, but I know there is a newer version of the theme but it is not giving me an option to update. How would I update it in this case?

Thank you