This file is mirrored on Tor at bctorowb7blvvryo.onion
The whole of Bandcamp has been mirrored/proxied over Tor using Alec Muffett's EOTK (https://github.com/alecmuffett/eotk).
The Bandcamp mirror can be found at bandc2v6rbqrn6vx.onion
As EOTK uses self signed certificates this solution isn't ideal and generates several security warnings. I would hope that Bandcamp would consider implementing this themselves and using a proper SSL certificate.
HTTPS/SSL isn't necessary when browsing .onion addresses as they are already cryptographically secured. However it is not recommended to downgrade from HTTPS to HTTP and Bandcamp (rightly) uses HTTPS as standard. If they implemented a .onion mirror their certifcate would provide addtional proof of ownership but not additional security.