It was for government owned computers, they didn’t want any pirated or virus-infected stuff, and at that point there was no way to lock down such a mish-mash of systems.
The software company (who also do things like run prisons these days) had given permission for us to run the software and given a set of fake data so we could go through the motions when talking people through things, but apparently that wasn’t enough to get it on the list.