Rhino 5 64bit Will not activate when installing

Hi guys hope I can get some help. I needed to install Rhino 5 to my new computer but when I tried to activate it would not activate and I needed to contact support I think because the version is to old now. I have a purchased license key for rhino 4 and use it to install rhino 5. I have done it before successfully.

Have they stopped older versions from activating?

Any help appreciated.

You cannot use a V4 license key for V5. License keys are version-specific.