Question Providing extra materials via local file copy

Hello together,

I'm not sure where to post this so I hope this forum is correct.

We are currently working on a small learning game for children. After the game the parent may download some extra materials like a certificate, colouring pictures and some stuff to tinker with.
The problem is that we currently don't know how to implement this part. We wan't to put a zip in the project and copy it to a certain location. We currently have no approach for this .
Is this even possible with unity or should we rather open an automatic download via the browser? Something like 'open url' => browser opens => browser starts download => browser saves data in the downloads folder.

Kind regards,
Ben