I'll do that ASAP. On my phone atm, but it should be up within an hour.
Here is the pastebin debug log:
https://pastebin.com/md7yzfi4
From my admittedly limited understanding, it's running into "memoryerror" which I assume means I don't have enough free space? Which is weird, since I'm at 10.6 GB on my computer. I've never posted a debug log before, so I admit I'm not sure if I did it right.
Upon trying the Fiction.live Downloader Firefox addon, I got a 346MB file (with images) that Calibre refused to open, saying to "Try a more forgiving zip parser." Upon attempting with Adobe, I was able to open the file correctly.
Notably I am using Calibre 5.44, since I have a Windows 8 OS on my old-as-hell PC, if that matters.
Double edit: Upon restarting my computer for the 2nd time, it worked. I changed no settings, already restarted once, and have done absolutely nothing to fix it. God, technology sometimes baffles me.