Trouble with plugins in Sonar Professional

Hello.
 
I have just bought Sonar Professional and have some problems that I wish someone could help me with. When I installed it on my laptop I used the Cakewalk Comand Center. If I remember correctly, during the downloading and installing process I think there was an error on its way to my computer.
 
So far Sonar Professional seems to work somewhat ok, but say if I want to load in the Sonitusfx Reverb there is any presents to load in.
 
I was also curious to try the TH3 guitar effects plugin. I suppose that you can conect a guitar into my Focusrite Scarlett 18i8 2. gen soundcard and set the input level in Sonar and so on. I don't get any level setting inside of TH3 no matter what I do.
I tried to do the Authorisation process with the TH3, but I couldn't get any serial number so I set it for the demo-mode for 15 days, but yet there is no sound comming into TH3.
 
What have I done wrong? Is there something I am missing here? Hope to get some help here. Thank you.