Apologies, it seems i misread your post.
When executing a program as the 'currently logged on' user, the installer/command/... will use the active desktop session to display its information, hence the flashing of the command prompt.
We will take look if there isn't a way of hiding this behavior completely.
Thanks
old reply here:
Hi,
You should look if there is a way to silent run this installer. In some cases you can just add a parameter for this in your command but that depends on the program. There is no other way we can control the behavior of third-party programs.