Please add a sub in avast.com, support section, the center of a license, the form that you send to the license(avast free antivirus) for another year, without re-registration of a new license.
By re-registering, you provide statistics to Avast and let them know that you’re still
using avast!. The registration process is what allows Avast to keep accurate statistics of it’s users
and not simply guess as so many other vendors do. 
good, od, aha. There also would be able, to give statistics of how many people renewed the license for another year.
Not only that it helps with ensuring there are enough servers to support that many active users, so you don’t have problems getting updates.
how it will update the avast avast 5 for 6, it will still be the name of avast 5, in program files.
I don’t know how it will update on version 6 as we aren’t close, but it certainly won’t retain avast5 as it didn’t retain avast4 when the update from avast 4.8 to avast 5.0 happened.
Let’s cross that bridge when we come to it. 
http://www.idiomquest.com/learn/idiom/cross-that-bridge-when-we-come-to-it