There are no issues with Windows 7, and the are no issues with the Couatl engine. However, the QW757 does not install it, because it doesn't need it, it only installs the Addon Manager.
The Couatl program is only needed for our products, so it's installed only by our products or by the Stand-Alone Addon Manager installer for FSX, which might be useful to install anyway, but it's not needed by the QW757.
The most likely caused of Couatl crashing, it's a bug of your antivirus that has mistakenly blocked it, wrongly believing it might be a threat. In this case, as explained in many other threads, the installation should be made as follows:
- DOWNLOAD AND INSTALL the Stand-Alone Addon Manager with the antivirus entirely OFF
- Uninstall the Stand-Alone Addon Manager. Reply YES when asked if you want to remove the Addon Manager and the Couatl Engine. Reply YES to both questions.
- TURN OFF your antivirus. Don't just exit from its interface, but turn off the real time protection. Actual wording changes between products, however, it's the option to scan every file that gets open in real time, without user intervention.
- Reinstall the Stand-Alone Addon Manager with the Antivirus TURNED OFF. Don't launch FSX yet.
- Configure the antivirus to exclude the following files from scanning:
YourFSXFolder\bglmanx.dll
YourFSXFolder\fsdreamteam\Couatl\couatl.exe
YourFSXFolder it's usually C:\Program Files\Microsoft Games\Microsoft Flight Simulator X, if you installed it in the default folder.
- Now you can turn the antivirus back on, and launch FSX.
- Check you are seeing BOTH the "Addon Manager" menu AND the "Couatl powered products" menu under the "Addons" menu.