By the term "product" in the EULA is it only applicable to the game I will develop in UE4? or it will also cover any game that I will develop using another engine?

Development Programming & Scripting
1

I’m having some uncertainty regarding the EULA of EU4 special in the term product. Does the “product” means any application that I will develop in UE4 or it also covers any application that I will develop regardless if I develop it in UE4 (For example: Unity) starting from now?

2

Nope. If it’s not made by Epic then your fine.