need Avast 4 on additional computer

Several months ago I bought the Avast 4! package that can be put on 4 computers (?) and came with a additional disk. Well lo and behold some A-hole stole my laptop with the disk in side and now I need to install my Avast on a destop but cannot seem to figure out how to do so. Need help.

i assume you have to professional package…

you can download the installer from the website and install it using the key that you received (by e-mail?)

if you have run into your limit of 4 installed products already then you have to contact sales with your problem and i assume they will send you a new key that you can install on the machines again