Natural Scroll Direction: On with trackpad, Off with mouse

I already tried this:
Changing trackpad scroll direction with AppleScript in Yosemite

But it didn't work.

What I need is when I use the internal macBook Pro trackpad, natural scroll direction is enabled, and when I use an external mouse, it is disabled.

If this is impossible, how about the following alternative: when I plug in a mouse switch to "non-natural" scroll direction, and when I disconnect the mouse switch back to natural.

Hi just found a great app that totally fixed this and so simple! You can set the scroll direction for each device separately.

SCROLL REVERSER http://pilotmoon.com/scrollreverser/

Try this:

Go to Accessibility settings for Mouse & Trackpad in System Preferences.

Tick the

"Ignore built-in trackpad when mouse or wireless trackpad is present"

option.

Then, with your mouse connected, go back to your Mouse settings in the System Preferences and adjust scrolling accordingly.

I got frustrated about this too. I found scroll reverser but it didn't seem to work reliably and other report it doesn't work at all on Catalina. I decided to develop my own app to fix the issue called UnnaturalScrollWheels, it also allows to disable scroll acceleration and modify the number of lines each wheel click scrolls.

https://github.com/ther0n/UnnaturalScrollWheels