F1 2014 How to make driver changes?

F1 2014 The Game (Codemasters)
I've just purchased F1 2014, and I'm hoping someone can explain how YouTubers like Aarava make driver changes in their series? For example, the mods that give the 2017 F1 Grid to the 2014 game. How can I do that for myself?
Thanks! :D
 
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