Once again, I have already tried the suggestions on your linked post.
But since the only two possible reasons for Couatl.exe not starting without a log are:
- Antivirus interference
OR
- Missing system libraries
Either it's not true you don't have an antivirus, or you haven't configured it properly, or you haven't fixed the missing system libraries as indicated in the linked thread.
And, of course, since you said you have no antivirus, you cannot possibly be sure you don't have a *real* virus, one that might have caused the corruption in your system libraries to begin with.
Those are the two possible reasons why the program doesn't even try to start. Any other problem, like a crash at start, would have produced at least SOME kind of log, before it crashed. But since it hasn't, then the only possible explanation left, are external issues. Namely, the antivirus or missing system libraries.