Let me first says I have zero experience with Cura pre 4.2 but In theory the scrip should work the same. Someone please correct me if I'm wrong.
IF AND ONLY IF that is true and there is no automatic update function, there should be a "scripts" folder where your instance of Cura is installed. For 4.3 on Windows 10 that folder location is "C:\Program Files\Ultimaker Cura 4.3\plugins\PostProcessingPlugin\scripts". In here you should see the script file "PauseAtHeight.py". If so, make a copy of the existing file for safe keeping. In Windows you can "right click, copy" then "right click, paste" the file and follow the above procedure to replace it. Good luck.