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I remember that I had to finish casting first then I choose to dispell RIP spell with remaining casting dices in the 7th edition. Did that rule changed?
Can I dispell a RIP spell (by using casting dices) before casting at my turn?

It's still the same, you use casting dice to dispel RiP spells at any point during your casting phase.

Or their magic phase for that matter.

Just to double check, you can't dispel an RIP spell at the lower value the same phase it was cast, correct? So for instance, my buddy casts Spell X, I fail to dispel. I can't then throw my remaining dice at dispelling it at the base price now, but have to wait till my magic phase, can I?

Correct, you cannot attempt to dispell a RiP spell that was successfully cast until another magic phase.