You cant create an "exchange like binance" with download a script. Lol. It's not that easy. You need budget, you need license, you need security experts to check for vulnerabilities in the system, you need to hire coders and developers, you need expensive server systems to host coins daemons like bitcoind and many more. Even if you manage to find a good open-source code and fix most of the bugs and add translations, after a long time you will be bored doing that.
Think that an exchange platform is a business with millions of daily trading volume. You can't just risk user funds on random scripts you found on the internet.