Adding some extra comments to provide more context and detail.

HOW TO SEE WHAT UUX VERSION YOU ARE USING
Log into your online banking in a web browser, right click and view source.
From there all the CDN assets will have a version tag in it.

In extension.py:

# remember to import at the top of the file
from q2_sdk.hq.db.user_property_data import UserPropertyData

# check for feature "lookAtThat" ...