The error message is "See the logfile.'...twine.exe.log' for details". The log file is not there.
That's from the 1.4.2 version, but it gave the same error with my old 1.3, which used to work just fine until saturday, before resetting Windows 10.
Any ideas on how to solve this? I really, really, urgently need to get my old .tws files working.