Unity free version + IOS pro??

Can I use Unity free version combined with IOS pro version and still able to publish the game to IOS.
Or do I need to purchase Unity Pro first before installing IOS Pro add on on it?

My objective is to develop a game for Ipad.

Thank you so much in advance for asnwering.

Unity iOS Pro only works with the Unity Pro editor. You cannot have Unity Free and add the iOS Pro add-on to it.