Cubase 9.5 trials available

I am on mach OS 10.13.3 and want to try Cubase as an alternative to my current DAW Studio One have downloaded 9.5 and update the soft elicencer got the activation code by email and can I get the thing to install No! have got as far as inputting the activation code and using the Control centre but cant get past that point keep getting message saying no soft elicence available and that need USB Is so complex and frustrating i am at the point of giving up but would like to have one last try I have uninstalled and reinstalled things but still no joy any suggestions?? other software makers seem to have a much simpler process Help please!