Still have Native Access v1.3.1 on my system. I had Kontakt v5.5 and v5.6.6 installed and working fine together I just updated Kontakt to 5.6.8, renamed it to K5.6.8 and then copied again the v5.5 (from the backup folder) as the main K5 dll. Now I have three Kontakt 5 working at the same time. Just noticed the standalone K5.6.8 was very slow loading Wave Alchemy Revolution patch (and it also crashed once while trying other libraries), while inside VEPRO standalone (both 32 and 64 bit) loaded it quickly. Have to check its behaviour inside Cubase and connected VEPRO servers yet.