The inmydata client dashboard application installer includes the inmydata publisher application and the inmydata dashboard designer. You can download the installer from here.
You can also download the latest from your tenant web page if you have the right user permissions..
The download is available when you open the page to create a new visualisation, select the "Download Dashboard Designer" link in the top right corner.
Once you have downloaded the installer, run it on your target machine to install the cliant application.