@ThomaHawk Hey there I downloaded the scenario but after I launched the game and tried playing it I tried both in singleplayer and in multiplayer the mission wont launch with arror that a vehicle is missing.

Hello ! This is an error thah comes from the game itself. This kind of issue appear generally when you play a mission which requires mods... but you play it without them.
Unfortunately it isn't the case here.
I recommand you tro try again, and if it happens again, to verify the integrity of your game files from Steam

Oh thank you about that I actually checked the integrity and 24 files were missing maybe it was caused from moving the game to a second disc thank you for help.

No problem ! I hope it will work properly again :)