What is the ruling on someone who made a vow to provide free examinations for the poor after a number of years, then forgot and made a second vow with the same content if certain conditions are met?

A vow contingent upon a condition becomes binding if the condition is met. So, if the condition is met, the vow—which is to provide free medical examinations for the poor—must be fulfilled. If the condition is not met, then nothing is binding.