Instead of disabling the programs responsible for your system's security entirely, you might want to check if there are ways to add exceptions for FanFicFare. I think you would have to add exceptions for "calibre-parallel.exe" in Avast. The Windows firewall shouldn't interfere if there aren't any strange non-standard rules defined -- if there were, it would most likely simply block all outgoing traffic for that executable, so this really shouldn't be it.
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