To use an mBot, you do not typically download a file named "mbot joysro." Instead, you download the software (created by Makeblock). This software allows you to program the robot and control it manually using a keyboard or a virtual joystick.
If your goal is to drive the robot like an RC car:
: Search for the specific mBot version compatible with Joysro. These are usually hosted on community forums or the official server's Discord, as older official links for the original mBot (VSRO version) are often defunct.