Hi,
What Worked for me is creating an new shortcut from the installer to desktop ( select all cpu's )
-right click the shortcut -->properties and check
"run this program as administrator" (and or ,change for all users)
I also Disable the nagging UAC screen in the windows setting
start -->UAC -->never notify
ALso i'm no longer working with xpadder but mainly using "antimicro"
https://github.com/AntiMicro/antimicro/releases
I found this great alternative while working on my arcade frontend to control volume / mouse /etc
To give you an idea what I use to map my G920:
-5th and 6th gear in the H shifter not working (known bug) so I assigned keyboard keys in antimicro for that.
-Volume up / down to buttons on the wheel
-Mouse control with the dpad on wheel and left mousebutton to button on wheel. (navigating in GTL menu's )
-Enter and esc key mapped to buttons on wheel
Be aware that "Antimicro" also need to be ran as administrator to be able to work in GTLegends.
So Apply same settings.
-right click the shortcut -->properties and check
"run this program as administrator" (and or ,change for all users)
Another final issue with antimicro was not running at startup ( checked the option run at windows startup in app didn't work)
Added the exe /shortcut to the windows startup folder -->didn't work ( Windows logo key + R, type shell

tartup)
eventually , what did work was creating a simple bat file with link to antimicro exe and put that bat file in the startup folder.(Windows logo key + R, type shell

tartup)
Now the system starts automated giving me mouse /volume control from within the cockpit (dpad /buttons on wheel) and can double click the GTL shortcut on desktop to start the game.