Designer can be installed on any computer running Windows 7 / Windows 8 / Windows 10 (the computer does not have to be connected to a touch screen)
Use this brief video tutorial to guide you along the way:
Desktop is a user interface for the apps created in the Designer tool.
Desktop should be installed on the PC running your touch screen. The PC should have the following specs to offer good performance:
Windows 7 / Windows 8 / Windows 10, Intel i5 processor, 4GB RAM
* Minimum system requirements vary depending on how demanding the assets used in your applications are.