Well I trust my antivirus more than I trust the download because the software company in the .exe is "Unknown" and "Untrusted"
Not valid in our case, since we SIGN all our executable with an Authenticode digital signature certificate, which costs us money every year to renew, just to indicate users the software is NOT coming from an "Unknown".
If your Couatl.exe is indicated as "Unknown", this might indicate exactly the opposite: it has been ALTERED on your hard-disk, and it's not the version we distributed. That's the whole point of having a digital signature in the first place...
If the executable has been altered in your hard disk, this might happen for the following reasons:
1) Your antivirus, which has mistakenly identified it as a thread, also tried to "heal" it, which modifies the file and, of course, will destroy the digital signature, so the file would appear to be made by an "Unknown" publisher.
OR
2) You already had a real virus, that obviously didn't come with our software, that *infected* our exe, and this will also result in the digital signature being invalid.
I can only confirm, the Couatl.exe file which is located on the FSX\fsdreamteam\Couatl folder IS digitally signed, you can check this by right-clicking on it, select "Properties", and see if it has a "Digital Signature" tab. If there's no such tab, or the Digital Signature is reported as invalid, it means the copy you have on your system has been MODIFIED by "something" on your system, as explained above.