Hi and welcome to the forum 
The problem for FP5 update to A15 that you may have read about (long topic), occurs irrespective of whether you’re using the Fingerprint sensor or not. It occurs if the sensor is not in a working state. If your sensor functions then you’ll not be concerned by that problem.
However, there are other problems associated with that update too, so, unless you have a specific reason that’s pushing you, you might want to hold off anyway, until a new patch is published.
To read more about not receiving updates, and about the currently available FP5.VT28.C.042 you might like to consult this topic.