No luck. I am using a desktop PC (Debian Linux OS, not Windows), so "try another location" is not a direct option... Although I can change the phone's location around my house/yard when I use it as a WiFi "hotspot".
Also, I just finished a 4.4GB DVD image (unrelated to this game) download in under an hour. I tried again for this; Mega is still showing me >12 hours and Google Drive showing >8 hours. Google surprises me the most, because I usually have very high transfer rates when using it.
The reality is, the dev had to switch to hosting it elsewhere for a reason. That should have been the very first sign that something else needed to be done to address the issue.
But at this point, I am not going to try any harder.