While trying to register the Unity 3 preview, I have entered my Unity iPhone serial (which, I’ve confirmed on the store page, is valid for the Unity 3 preview). It goes through the whole process and appears to work fine until after the registration box disappears and then a dialog box appears that says:
“This version of Unity cannot be activated with a free or trial license”
I think I’ve ruled out my license not being legitimately able to activate U3 so I’m leaning towards a technical bug. Any ideas?