If you're looking to Download MultiLaunch Controller on your Chromebook laptop Then read the following guideline.

Software Andina MultiLaunch allows you to use your iPad or iPhone to launch programs on your desktop device. It consists of two parts, a Controller and a Launcher. This app is the Controller which is installed on an iPad or iPhone. It will communicate with desktop machines that have the Launcher installed to launch programs. The Launcher is installed on a desktop machine. This would be any machine running a traditional desktop OS like Windows, MacOS or Linux regardless of its size or whether it is physically on your desktop. This could include anything from large servers to a device literally sitting on your desktop to laptops and tablets. You should install Software Andina MultiLaunch Launcher on your desktop machines before installing this app as it will not do anything interesting without a Launcher to control.