The downloaded ebook will still be in a temp directory until you quit Calibre.
Each time you run Calibre, it makes a unique directory named calibre_<random letters> in your temp dir. Each FFF download session in turn creates a unique directory named fanficfare_<random letters> inside the calibre temp dir. And inside the FFF temp dir, is a temp copy of each downloaded book for that session.
FFF cleans up its temp dir when the download session successfully ends, but not when aborted.
Calibre cleans up its temp dir (including FFF's temp dir) on exit, except on crash.
I don't know where different OS's keep your temp files. FFF's debug output will show you where FFF is writing temp files, but you'd have to open the debug log while Calibre is still running, or just remember/save the temp dir area for next time.
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