I swear I've seen the same design used for a lot of other scam "jackpot" sites.

Anyhow, it's needless to say that the bets on their platform are completely fake. No way are they actually going to generate that much betting volume as a site that no one knows. Even well known gaming sites don't generate this much volume consistently. Their "78 online" on the chat box is also fake, most probably.

Obviously if you're asked to download stuff for something that you don't know, don't do it. There is too much risk of infecting your computer with a virus. Given that the site itself is not legit, do not deposit anything on their site.