Hi Lily,
not working
There is “Use WP cron > Interval” option in “WooCommerce > Settings > Order Status Rules > Advanced” – by default it’s set to “Once hourly”. This means that our plugin goes through the orders once per hour and checks if the status needs to be changed for any of them. Try setting this option to e.g. “Once every minute” – I believe this should solve it.
payment gateways
It will work with other PayPal plugins as well. Once you install a new PayPal plugin, it will be automatically listed in our “Order Payment & Shipping > Payment gateways” option.
I hope that helps. Please let me know if you have any questions.