Where can I get the custom download code?

Question

WordPress

Hello, I want to create a marketplace for downloadable goods and decided to use the
WC Marketplace plugin for this. But when I registered the seller, it turned out that the seller could not download the goods.
I wrote to the developers, because in the instructions on the site it says that there should be a section in the settings in which you can enable permissions to download downloadable products
But this parameter was not in the settings, I wrote to support and this is what they wrote to me

Currently, the supplier can download downloadable products, but there is no other tab to allow vendors to download these products. To do this, you need to make a custom code and add this module to your site.

In general, this very custom code is gentle to me.