The entire HMI solution doesn't require any installation: everything it needs lives in a single folder. Deploying eScada, on the first machine or on the next one, is as simple as copying that folder to the internal disk, to a network share or, if you prefer, to a removable support.
This makes moving or duplicating a solution a matter of minutes: copy the folder to another laptop, desktop PC, industrial panel or server, start eScada, and you can continue to operate with your equipments. No installers, no dependencies to satisfy on the target machine.
The same simplicity turns disaster recovery into a trivial operation. If the hardware breaks, either move the removable media to a spare machine, or restore a copy of the solution folder on any other computer in your company: within minutes the supervision is back, with the same project, the same data and the same behaviour.
When an HMI stops, production usually stops with it, and machines and plants are left without supervision. Reducing the recovery to copying a folder and starting an executable means measuring downtime in minutes instead of days spent waiting for a technician or a replacement unit: a concrete benefit for productivity, and for the safety of machines and plants.
Even the OS version you are running is not of importance, as you can run your HMI solution using other types of hardware and OS.