AutoHotkey Script Stopped Working

[cubpilot54]

I have been using Maarten Boelens' "Pseudo Fullscreen" for years without a glitch with flight sim FSX and P3D V3 and V4 but now here is what happens:
click on AutoHotkey.exe and a webpage opens telling me I need a script.
This has never happened before now. I have always started with the.exe file and then the Fullscreen.ahk script. Then use WIN+F11 hotkey

After hours of trying, I finally got FullScreen.exe and Fullscreen.ahk loaded. Pressed the hotkey and got full screen BUT my Flight simscreen shrinks to about 1/4 of the monitor.
Any help greatly appreciated.
Neal Howard

Specs:Win 7 Ultimate
GeForce 1060
Panasonic UHD 3840x2160 **
** only change to my system