As I confirmed multiple times, there are no issues whatsoever with any PMDG airplane, they are all correctly patched and they are all working.
That is, of course, assuming you are using the current version of the installer. Fact somebody said "Couatl doesn't start", suggests a possible same root cause: not getting the latest version of the installer AND Couatl not starting, possibly because the antivirus blocking both so, configure the antivirus to exclude the whole Addon Manager folder and try again.
Also, if you had issues with PMDG caused by an OLD version of the FSDT Installer, just updating the installer won't fix this, you need to uninstall/reinstall the airplane.