Space issues - Updating to Komplete 11 from select (MBP)

Hi,

I am updating Komplete Select to Komplete 11 on a MacBookPro that has 16 megs of RAM and a half-tera external USB SSD.
This MBP has an internal SSB too (a 200 something GB), and that internal one is almost full.

How much free space do I need on the internal SSD, when I want to use the external USB-SSD to store as much of the Komplete 11 libraries and stuff, as possible?

Am intending to install later the Komplete 11 to an another MBP (with only 8 megs of RAM), using the same external USB-SSD to contain the as much of the program libraries and whatnot as possible.

How should I progress, as some people warn against the new NI install software (Native Access?), and some people say one ought to stick to the older version of Kontact to avoid problems?

Can I somehow "tell" the installer what version of Kontakt I want to be installed? (Remember I have now only Kontact player, since, as I said, I am upgrading form Komplete Select to Komplete 11.

Thank you for any attempts to help!

AC