Hi,
I am not an expert on this field (especially on that specific remote management software), but
here's an article explaining how to create packages for silent installs from our installer packages.
This article is about our ARCHICAD 22 (and newer) installers, where we started using a new installer technology specifically to support such workflows. It may not solve your problem for installing the ARCHICAD 21 update, but for future versions it might give you insight.
It might also be worth checking out this other topic about creating packages with custom environments (the people there might be able to help you out):
https://archicad-talk.graphisoft.com/viewtopic.php?f=5&t=62484
Good Luck!
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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