When you have an existing installation, you might need to change a device in the project file. This is easily done by downloading the project file and finding your new device in the device list. When that's done then just drag it on top of the device you wish to replace. You will be prompted with a couple of message boxes. Here you need to map the new device compared to the old, e.g. VGA on the old becomes Computer1 on the new device.
Check out the short video to see how it is done!