Error when installing GSX

[AviaAlpha]

 Hi there forum people,

 I have recently started to use P3Dv5.3 again. I managed to optimise my simulator to fit my pc specs and in doing so I had to uninstall GSX level 1 and 2.
 But when installing I get the following error in the photo's below.
 I installed the installer from when I clicked OK and I am still getting this issue after deleting the installer and trying to install a more
 up to date one or something.

 Hope you can help
 Thanks.

[virtuali]

I'm not sure what's not clear about the message. It says the FSDT installer can't be used to install products for FSX or P3D, and is saying it's not a problem, because their installers are always freely available on the FSDT Downloads page.

Yes, you can use the FSDT Installer to UPDATE products for FSX/P3D, but to INSTALL them, you keep using their installers, as you always did.