Have you downloaded the updated newest patch? I think it got fixed :p
considering the fact that the error comes from a missing sprite or more likely a wrongly called one it might have indeed been fixed. I'll try to see if I forgot about downloading the fixed files.
(To be more precise it says that "tenky_sprite2 is not defined"). I have to say that i make thoses kind of mistakes quite frecantly when i code with ren'py XD
sorry but I restarted the game all over again after reinstalling it just in case and i still get the exact same error "tenky_sprite2 is not defined" . ^^'
Perhaps there is a problem with either the real name of the sprite or it has been moved out of his folder ? I couldn't check myself as we have no access to thoses informations in the distributions versions of a ren'py game.
It would be weird though considering most peoples have been able to play without encountering this issue...