Edit: solved - thanks to everyone who helped - I was on old Native Access, but it didn't tell me there was a newer version!
-------------------------------------------------------------------------
Today I got around to trying to upgrade to 6.5.
Opened Native Access, and it said 6.5 was already installed. So I started Reaktor. Still the time limited beta version.
So I uninstalled. Then refreshed.
Native access then gave the option to install 6.4.3, but no option for 6.5. So I installed that, and refreshed, and rebooted etc.
Native Access now things I am fully up to date with 6.4.3 installed, no option to upgrade to 6.5 !
Any thoughts or solutions?