So I downloaded unity found a brackeys tutorial and I needed a programming language. If anybody knows how to get  C# for free please tell me because I entered the game jam before I realized this so I have 5 days to learn how to program. All I've made bad games on scratch my name there is bap_ so go there if you wanna see stuff ok please help bye. -Itsbap  (because bap was taken) 

You dont download a programming language. You download an editor or ide that can edit code of that language (for more information see Armed Gorilla's comment)

Hey man, I suggest you start with a simpler gaming engine or join the later jams so you can iron out your skills first without any restrictions. Of course that's just my advice though. I hope you have fun in the jam!

download an IDE

also I think learning to program in 5 days is kinda hard

C# is pretty hard if that didn't work out next time you can try python with pygame because that's way easier or if you want a simpler game engine you can use GDevelop.