Can't install: PayPal issue

I just tried installing Jigoshop 1.9.6 and went to activate it and couldn’t. Got this error instead.

Parse error: syntax error, unexpected T_FUNCTION in /home/content/wp-content/plugins/jigoshop/gateways/paypal.php on line 21

I assume this is where the problem lies:

add_filter('jigoshop_payment_gateways', function ($methods){
	$methods[] = 'paypal';

	return $methods;
});

How can this be solved?

https://ww.wp.xz.cn/plugins/jigoshop/