How do I set up email to receive a WooCommerce digital product?

Question

Online shopping

Tell me, kind people, for what reasons the buyer does not receive a message about the purchase of goods with a link to download the product, the settings in woocommerce are correct. Or it comes to the mail, but when you click on the link, an incomprehensible file format is downloaded, previously it was simply transferred directly to the cloud with the product for download ... there were no problems.
It also happens that money comes from the yumani from the purchase - and the status remains pending payment and, accordingly, the link to the product also does not reach, and if it does, I wrote above - an incomprehensible file format is downloaded ...

My mail.ru mail is indicated on my website (new, canceled and failed, rest client)