Remove Microsoft Download Tool from guide
The guide at https://www.ixsystems.com/documentation/freenas/11.2/install.html suggests to use the Microsoft USB/DVD Download Tool to create a bootable USB drive on Windows. That tool is not usable with 11.2-U1, it complains about "invalid ISO format".
Suggest to remove the line that reads:
"Microsoft provides the USB/DVD Download Tool to create a USB bootable image from an .iso file. Follow these instructions, but enter the name of the downloaded .iso into the SOURCE FILE box."
A good alternative would be Etcher, as it is cross-platform and easy to use. Maybe something along the lines of:
"Etcher can be used to create a bootable USB drive from the FreeNAS .iso image. Select the image, select the drive, and flash."
Where "Etcher" would link to https://www.balena.io/etcher/