Thank you for feedback. Was it only setupNUT that you tried or did you also install for other boards too? I have been told that Norton also complains about setupNUT even though both VirusTotal and Internxt report it safe. All my setup files are created using the same script so it must be something to do with the USB HID processing as Chessnut is the only board that uses that.

I've submitted the file to Microsoft as a false positive but based on comments on the Microsoft forums about false positives on Wacatac that will have no effect all. Apparently the "!" in the name means that the detection was found by Defender's AI search which means even Microsoft probably don't know why it was detected. One of the downsides of black box neural networks.

Were you able to mark the file as safe and install it anyway?