from the NI forum , someone explained me this :
"My understanding is that K5 uses a new compression format for the files which uses much less space. Unfortunately, to Use K4 and K5, you do have to install both libraries."
"You don't really have to. I use Kontakt 4 library without issues in Kontakt 5 - it just doesn't show in the Libraries tab. You can still load its NKIs from Files or QuickLoad (if you drop the K4 library folder in QuickLoad)."
i'm gonna try to load K5 stuff in K4 like this , and erase the bigger one !!
Still have zero infos on my order and shippenent of K9U ...that was my week of , i wanted to have fun ....:( dam
in case you want to participate :
http://www.native-instruments.com/forum/showthread.php?211992-Kontakt-4-kontakt-5-2-times-install-of-the-library&p=1239269#post1239269 By the way OlPal , how is the cuba thing ? i'm tempted but say to myslef let's wait Ultimate 10 ...