Start with the first one.
3 and 4 are different than the first 2. 1 & 2 have full guides/recipes how write certain type of short pieces (21 each).
3 & 4 are mostly just videos. 3 has a couple of hours of videos about 6 different "harmonic ingredients that transform scores" and 4 has 3 hours of videos about 4 similar "spices".
I have the first 3 and I'm wondering what people think of the 4th. I wasn't really excited about the new style of 3.
"*JamPoints cannot be combined with the auto-coupon."
Also new purchases and upgrades and the same price again. That really makes be not want to upgrade.
If you're wondering why you don't have any free HD/SSD space, check your IKM download folder.
I had 50 GB of old Tonex and AmpliTube installation files there. And other old versions of IKM files that can be deleted.
For some reason the new version shows a menu bar.
You can download the new version from here if it doesn't auto-update:
https://www.native-instruments.com/en/support/downloads/