How do I locate my registration key in avast
You don’t need any registration code for Free. You can register if from the GUI. Whatever, http://www.avast.com/resend-license-free-antivirus.php
Which avast version are you talking about? Free, pro or AIS?
He is talking about Free version, I think.
I think we’re waiting for his answer. 
I have a similar problem.
Where do I find the key for the paid version? I have paid for 3 PCs for one year and the link in the email does not give me the key in order to get the product on the other 2 PCs.
The link automatically updates the machine I accessed my email on by asking ‘am I sure I want to insert the key’. I say yes and it is done - but no key is visible to take to the other 2 PCs.
Hope someone can help.
Many thanks
Brett
Use the same key in the three computers.