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  • This is the way the developer does it in ACF5
    $major = intval( acf_get_setting('version') );

    That function does not exist in ACF4, it’s done this way instead
    $version = apply_filters('acf/get_info', 'version');

    I would go with checking for that function and assume 4 if it doesn’t exist and use it to get the version, the method used in 5 is might stay stable into the future.

    You could probably also to something like get_option('acf_version', false);