Unity4->Unity5 license

I have Unity4 Pro + Android Pro + iOS Pro
If i upgrade to Unity5 Pro (not iOS and android), I definitely can’t use iOS and Android pro features in Unity5, but will I be able to install Unity4 and use Unity4-iOS-pro features?

Correct, you will need to upgrade the add-ons too if you wish to build with unity 5 to those platforms with pro features