On PHP 7.2 `is_countable` creates an undefined function. `is_countable` is not available until PHP 7.3, <https://www.php.net/manual/en/function.is-countable.php>. 

In PHP 7.3, I get this error... "count(): Parameter must be an array or an object that implements Countable".

BUT, I found this... instead of `is_countable($value)`, **it works with `array($value)`** which I got from this Stack Overflow post, <https://stackoverflow.com/a/59818642>.

class.xmlimporter.php - switch is_countable() to array()

…erangue!

Fixed the less than character as < is invalid and should be &lt; 

That character caused an error in the installation process