That's Broken Skull Fairgrounds. Literally the mod it's self is just called Fair Grounds, and all you have to do is look it up on the Repo in the game by typing in the search bar Fair Grounds and it'll pop up. --- Post updated --- Hit the play button on steam In all seriousness. though, what do you mean "how do I play"? Are you having issues installing the mod? If you're looking for the monster trucks those have been moved to their own website called BeamMonsters.Com where you'll have to learn how to manually install mods to use them (Really not hard to do at all).
I mean like I downloaded but I just get a bunch of code I watched the sounded entertainment guy I'm trying to do what he does
If you're manually installing the mod.. Drag and drop the Zip file (still zipped) into the Repo folder so the game reads the zip file as a Repo mod. This is the file path you should take.. I will say this though. You could save your self a ton of hassle and just get it from the in-game Repo.. I've said this before, and I will say it again. Don't follow what youtubers say, yeah some are cool an all but I found out the hard way that the way a certain youtuber showed YEARS ago was actually how mod bandits installed stolen mods and was the incorrect way of installing mods which in the end, ultimately breaks your game which seems to be the case for you since you're getting nothing but code. Follow the instructions provided here on the website, and listen to what a lot of the long time members here say. 98% of the time they are correct in what they say cause many of them are mod authors them selves.