Hi Joe,
thank you for getting in touch. I am sorry to hear that you are experiencing issues.
I have checked your account and I can see that the order has been correctly fulfilled to your user account, however you are on a non-supported Operating System, Mac OS Catalina 10.15, I therefore suggest that we arrange you a refund.
Kind regards
"Electric Keys - Diamond" needs Kontakt 7.8.0 to run. With Kontakt 7.5.0, the minimum supported macOS version was upped to 11.0 (Big Sur).
I assume you're using the old/legacy Native Access 1, not Native Access 2, is that correct?
It likely won't show up in the old one.