YITH WooCommerce Waiting List Premium
Unfortunately, it becomes challenging to update the YITH plugins, Because of their restricted membership plans and strict account banning policies. That means we might not be able to keep all YITH plugins updated for some time. Where possible it's recomended to use reasonable alternatives.
The YITH WooCommerce Waiting List plugin allows your customers to request an email notification when an out-of-stock product comes back into stock.