Friend here. I have disabled my firewall, disabled my antivirus, added an exception to both (it was already there before but I redid it just to make sure), forwarded all the necessary ports, disabled every possible protection setting on the router, reinstalled the game, cleaned every file from the PC, once again uninstalled and reinstalled it as per the rules on the blue sticky above, and it still doesn't want to download the world and is stuck at 0%.
Likewise, I'm still having the "E" issue on the server, regardless if we play Navezgane, the preset random world or a newly made random world.
Aurani will once again provide both our logs.