When upgrading to BIAB 2017 from an earlier version (2014 in my case), does 2017 get installed right over the earlier version, or is it best to install it into its own directories?

Also, I'm really curious whether anyone runs BIAB (especially 2017) directly from the little USB hard drive that it comes on? In the voluminous information online, I recall reading somewhere that this is possible. If it is possible, what's the down-side and what's the up-side (other than saving HD space)? Does it require less configuration (ie - for MIDI/Audio settings) than if you install to your computer's hard drive?

Thanks!


Kawai VPC1 MIDI Controller; Asus A53E Laptop running Windows 7 - 64 bit; BIAB 2017 UltraPlusPak (upgraded from 2014 EverythingPak), running from Laptop's Hard Drive.