Installing avast on a new computer

I have recently renewed my avast antivirus subscription update for 2015. But I cannot see where I activate the new antivirus program, at the moment the software isnt working.

So my questions are: How do I re-active avast? (I am a paid subscriber)

And secondly, if I want to install the avast software on a new computer, how do I go about doing that?

And secondly, if I want to install the avast software on a new computer, how do I go about doing that?
Download and install it. Just like you did on the current system.

Enter the license in settings > registration

I appolgise for the triple post, my computer crashed and I didnt realise that the post was post 3 times.