Where do I get them?

I'm new at speedruning this game. How people on videos use autosplitter if I can't load an autosplitter for this game (that what livesplit says). And I quite don't understand one another thing. If I want to speedrun all 30 levels, I have to use livesplit or would an in-game timer be enough?

Where can I find them?

I just wanted to speedrun red ball 1, when suddenly this message pop up.

If I press "Нет" (No) the timer won't automaticaly start when I move in rb1

If I press "Да" (Yes) splits are going to reset and the timer also doesn't start when I move in red ball 1

(I also don't know why it says Geometry Dash)

Help please

what's the difference between deterministic patch and regular version of red ball 1?

and also what is IGT edition?