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Yes, the caster of the spell would have to be able to see the player that he's casting it on. Otherwise it wouldn't work.

 I disagree. Even if blinded, a caster can still cast a spell at a target.

 And how is said caster going to know where the target is? Go outside and close your eyes can you with 100% accuracy pinpoint where any noise comes from? How would a caster who can't see cast a spell on a target falling from the sky at terminal velocity?  The question boils down to this Rules as written/ Intended vs Rule of cool how is your game run? the answer must be the same for all players 

 Nothing in the spell (or any spell really) says you need 100% accuracy pinpoint to make it work.  If you have added "able to see" to all your spells that's fine, but it isn't as written.

The danger of reviving old threads like this is that the people who respond often don't make distinctions between which version of 5e they are talking about.

MPA had it right: in 2014, there is no mention of needing to see the target in question, so simply knowing that a target was falling (whatever that means for your game) to then target them was enough. In 2024, "...that you can see..." was added to the Casting Time section of the spell.

 I stand corrected, I did not see that part for the trigger.