Hey @tobitaurus,
The issue in the script is because of the new color mix node,
The FAC input changed name to FACTOR.
Open a text editor window and click the ‘Browse Script’ menu at the top, the anatomic-lex_UI.py script should be there, select it.
On lines 42, 43 and 44 you will see at the end of each line .inputs[‘Fac’], change the Fac to Factor.
Then click run script.

The UI tab should now appear.
Save the file, this will save the updated script also.