Skript Help TuSke (1.14.4)

[Brot]

Skript Author: Brot
Minecraft Version: 1.14.4
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Full Code:

#CODE
#+

        if arg-1 is "+1":
            add 1 to {am.%player%}
            make player execute command "/enchant"
            if click action is shift left mouse button:
                add 10 to {am.%player%}
                make player execute command "/enchant"
# -
        if arg-1 is "-1":
            subtract 1 from {am.%player%}
            make player execute command "/enchant"
            if click action is shift left mouse button:
                subtract 10 from {am.%player%}
                make player execute command "/enchant"
#CODE

My Problem is: how do i check if a player has clicked the GUI of TuSKe with "shift left click"
pastebin: https://pastebin.com/9Ay5Zv5J
Errors on Reload:
There are no errors its just not working


Other Useful Info:
Addons: SkQuery v4.1.1 | Skript 2.4-beta9 | TuSKe v1.8.2


Troubleshooting:

Have you tried searching the docs? Yes
Have you tried searching the forums? Yes
What other methods have you tried to fix it? I Have tried many things pasting codes