Hello guys i dont now why i have not challenge in teardown .and i can not find nowhere.i have downloaded teardown from steam unlocked.thank you

Hello, Is this the game you mean? https://www.speedrun.com/teardown

If you click on that link you will see they have a Forum and a Discord, as well as what appears to be an off-site leaderboard. I would advise asking your questions in either their forum or Discord, or contacting one of the mods :) good luck!

Also, you might want to check first if the teardown leaderboard accept pirated versions of the game, since steam unlocked isn't exactly providing you with a legal copy.