Update ionic in order to have both versions - How?

Hello everyone,

I am using ionic 1 for the last 7 months and I have an active project which I ll keep in ionic 1.
For a new app I decided to go with Ionic 2.
So how do I install ionic 2 and still keep the current app with ionic 1?
From the get started Page I have the impression that It works without any issues… but I really wanna be sure everything will keep working as it should.
The ionic 1 version app is using ngCordova and some related plugins… Ionic 2 is utilising ionic native(?)
So please help me out on how to do the update(?)

Thank you in advance for your time reading this!