I'm still on P3D v4.3, as I'm unable to install v4.4. How would I be able to download the installer for version 4.3? I am also having the exact same issue with all of your airports- which aren't v4.4 only as far as I'm aware.
I'm sorry, but most of our airports requires GSX anyway to work, and since GSX now supports only 4.4 minimum, you don't have any other choice than to update the sim.
Please clarify why you are "unable" to install 4.4, the latest version. which is 4.5, it's a free download from LM and it doesn't require to reinstall any of our addons, if this is the reason why you are not updating.
Just download the P3D 4.5 Client and the 4.5 Content, and you can update an exiting installation without affecting any installed addons.