My idea is to request the Instagram Feed widget because it is not in the list. Thank you very much! 
Hey there and welcome to the Community, @Luciana_de_Tezanos 
I am glad to say that the Instagram Feed widget is available in our catalog - Instagram Feed widget - Free Website Instagram Widget.
Give it a shot and let us know if it worked for you 
Hi @Luciana_de_Tezanos, indeed the Instagram Feed is there for you to test it out!
Tell us your use case and what exactly you’re trying to achieve - we’ll be happy to advise and guide you