You can find the software here - scroll to the bottom.
There is another way, using free software from Steelseries - the ExactMouse tool, which does one thing and does it well - kills the macOS mouse acceleration. The first is the terminal settings approach, to just kill acceleration without touching sensitivity. If you would like to adjust it here are the options I tried, and what worked for me. This works well in two cases - a) you're not using a mouse, you're using a trackpad, or b) you've been using a Mac for a long enough time that you're used to it. But there isn't any way to set the sensitivity independently of the acceleration. You can change the acceleration value, and there are ways from the terminal to turn off acceleration altogether. So X movement on the desk doesn't always correspond to Y amount of movement on the screen. On a Mac its different - when you move the mouse slowly, the sensitivity goes down, and when you move the mouse quickly, the sensitivity goes up. So X amount of movement on the desk or mousepad translates to Y amount of movement on the screen, where the ration X/Y is always constant. Without acceleration, Windows allows you to set the mouse sensitivity directly. Windows doesn't accelerate mice unless you enable the enhanced precision checkbox. If you're coming from the Windows world, it takes some getting used to. When I first set up my Mac to be used as a desktop, the transition was made a little harder because of how macOS handles mouse movement, specifically mouse acceleration.