For anyone else having this problem and seeing this, it's usually caused by being behind a firewall or VPN, which causes server to deny access to download the files.
Hi again! I only use Windows and macOS myself, and I don't have that much experience with Linux. We're exporting the Linux version as a courtesy, and most Linux users have been running the game without any issues. I suggest you check with the Discord community by asking in #general channel to see if anyone can help. Sorry that I'm not able to provide better help myself!