This is the least user friendly way to update your apps.
Since it became available I’ve been using the Google Now Launcher on pretty much every phone. Though it’s of course pre-loaded on Nexuses and now Motorola phones, I even go out of my way to install it on my Galaxy Note 5 and Shield Tablet. It’s a great launcher — but seriously, why can’t Google just communicate when it’s going to dramatically change in function and appearance through an app update?