woocommerce. Error when placing an order?

Question

WordPress

Good day. There was a problem. I installed the WC Place Order Without Payment plugin. Everything was fine until the last update. After it, upon confirmation of the order, the order was automatically transferred to "Waiting for payment". Although it used to be translated into "Processing". Well, it would seem that there is nothing to worry about. The only thing is that if, after confirmation of the order by the manager, send a letter with payment details to the client, the link is not working. More precisely, the person is redirected to the checkout page, but instead of the order details and the "Pay" button, such an error appears. "Order status is "Pending Payment" and cannot be paid. Please contact us for assistance." This problem is solved only by the demolition of the plugin. I tried to put another plugin WC Direct Place Order Without Paymen. There is no such problem, but there is another one. When the client presses the confirm order button, he gets an error on the same page. And my order comes. In addition, I’ll say that this is exactly the problem that arose with the previous plugin, but updating it helped. But the same update led to the problem described above. Do not judge strictly, the site was created according to the lessons on YouTube :) I don’t particularly understand this.
Thank you all in advance for your replies.