The official soundtrack for the first volume of Vermis is available not only on cassette from Hollow Press, but also as a digital album via Qobuz or directly from the artist on Bandcamp. You can download it for free from Bandcamp (but if you like it, consider supporting the artist).

I'll also leave a link to the album on YouTube. You can use your favourite frontend to watch it.

• Bandcamp: https://radagasttenderofbeasts.bandcamp.com/album/sounds-of-the-world-vermis-vol-1-melodies-of-the-unknown
• Qobuz: https://www.qobuz.com/us-en/album/vermis-sounds-of-the-world-vol-1-melodies-of-the-unknown-radagast/o62817skv7j7b
• YouTube: https://www.youtube.com/watch?v=YtmJgCHxt9s