To Install and activate the OptimizeCheckouts plugin, you will need to have purchased the OptimizePress Suite plan, otherwise, you will not see it inside your dashboard.
Install the OptimizePress plugin.
Once installed and activated, click on the Dashboard link inside the OptimizePress menu to take you to the main Dashboard area.
You will see a list of all of the available tools you can activate and use.
Scroll to the OptimizeCheckouts plugin and click the blue Install button.
You will now see OptimizeCheckouts on your WordPress menu ready to use.