Sorry for the slow reply Nicky - timezones plus work
I'll give you my understanding and it is just my understanding so please forgive if I'm getting the wrong end of the stick:-
The original Massive is included if you buy *any* Komplete 12 version from the 'select' version upwards (so regular, ultimate and ultimate collectors all get it). You do not get it if you download the freebie I linked to.
The standard Komplete 12 is discounted heavily in a current promo and allows upgrades from Komplete 2 to 11 for £79 UK which is pretty good if you're on an old version! I'd imagine it'd be Christmas for someone going from version 2 to 12. £159 gets you from your current version of Komplete Ultimate to the latest one. It's a crazy amount of stuff..... I haven't installed everything as there is, for example, a cinematic instrument for making atmospheric jumpy noises for movies. It looks very cool and fun but I don't spend much time making atmospheric weird stuff for movies (read that as 'absolutely no time at all and don't think I'll be starting). So whilst I'm sure it's awesome it's another 30 gig of hard drive space so, for what I do, I'll leave it in the library for now
Regarding Massive X, you get it as a free upgrade from the regular Komplete 12 and upwards. It is *not* given as a freebie to folks who own K12 Select.
https://www.native-instruments…dles/komplete-12/compare/
On my PC, both still show up as separate plugins and they are very different beasts. I'm pretty ignorant with fully understanding all the nuances of different synths so I can't really give a decent comparison other than to say that I like both I've had a quick play through the presets and X sounds very impressive but then I'm still impressed by pretty much every other soft synth I have so I'm probably not the target audience
I know there are folks whinging that Massive X is CPU heavy and it is! My PC is maybe 5 years old and for a typical arrangement I do where I've got plugins on every channel I might hit 50% at mixdown. Massive X has some patches that hit 30% CPU on my system with nothing else running! Obviously it's version one so they might well do a 1.x release at some point soon to cheer that up.
Hope this helps - I'll be happy to answer anything else I'm able to but if you ask me to explain how to use Reaktor then 'I'm out of here' as it loses me completely!