Hi,
I'm experiencing the same issue with Substance Painter. Yesterday I was using it and the update popup just appeared. I downloaded it and installed it.
It seems at this point, Substance Painter was opened, and uninstalled incorrectly to push the update : therefore the license is always seen as running for more than 24+ hours now, in the same computer I am trying to use Substance Painter.
Did you update too while running Both Substance Painter & Designer?