Downloads - bulk uploading

Opencart 2.1.0.1

I need to create about 4000 downloads and then associate with 400 products. I'm looking for a way to minimise the keying involved.
The products are already created.

I have identified this extension:
https://www.opencart.com/index.php?rout ... ion_id=185
This allows me to FTP all the downloads up and creates the downloads, but I then need to manually link all 4000 downloads to their products.

Alternatively, this extension (Product Downloads Pro)
https://www.opencart.com/index.php?rout ... on_id=4968
This one lets me upload and link to a product in one go, but I'd then need to do that 400 times, one for each product.

I realise there's a lot of downloads/products here, but before ploughing through this I wondered if anyone else had a better solution.

Thanks in advance.

Is there a logical way to link the downloads with the products? like a reference, name or ID that is shared?

Yes, they are linked by name.

To expand, this is a site selling mp3 albums.
The product names are album names, and the tracks are named:

albumname-tracknumber

However, the tracks could be renamed in a different format if it helps.