So, I had ~3GB free and I tried to download a 2GB file. It failed because it said I ran out of disk space. My disk still shows that I have about 400MB free. According to this post (How exactly does MEGA's download work?), it stores the file then copies it(?) but, the path in the answer is relevant to PC and I'm on a Mac.
I have searched for both the name and the filetype and I have scoured the Google Chrome folder in Application Support.
Not only can I not find the file but, now I have even less available space!? Do I really need twice the amount of space and, where do I find this mystery file so I can either use it or delete it?