Hello, I am the guide author, thank you for reporting this issue.
The WFH Busy Simulator uses some new features for the IconWidget. Those new features were added to the library, but we hadn't made an official release with them yet. That means that the "Download Project Bundle" links where you likely downloaded the code and libraries from would have gotten an older version without the required new features.
I have just made the release for that library now so after a day or two the "download bundle" buttons will automatically start containing the newest version needed with those features.
In the meantime you can download the library file from the Github Release page here:
https://github.com/adafruit/Adafruit_Ci ... tag/1.17.0
Downlad the asset named "adafruit-circuitpython-displayio-layout-7.x-mpy-1.17.0.zip"
and then unzip it and copy
adafruit_displayio_layout from inside of there into the
lib folder on your device.