Hi,
I just installed P3D v5 and was in the process of installing the Chicago Airport V2, and during installation process, the installer recommend I stop the installation and install GSX2 first.
So I did that, and when I began the GSX2 installation, I got the following error message, see attached.
I went to Programs and Files, and uninstalled what had partially been installed.
Tried installing GSX2 and got the same error message
Bill Clark