This is what you want, the original Materia Medica? It's 0.8 gigabytes. It took about 2 hours to upload it, but it's a RAR archive, so use Winrar to decompress it.

The ancient language version. I hope you can Hlod it. At the bottom of the 6th image, click on "Click to download" to download.

If there's no download, refresh the page and you'll see it.

Add it.