Need help with a host settings tweak.

So I recently migrated a site over to WPMUDEV. and there is one plugin and it seems to have 404 issues with. It is a file download plugin for my clients to download files on the front end. but when trying to download files, it generates a 404 error. I was reading the plugin FAQ and I see that WP Engine has the same issues, So I am thinking it may be the same here?

There is a solution for WP Engine. https://www.joomunited.com/support/faq/wp-file-download/404-error-on-downloading-file-in-wp-engine-hosting

Please check and help.